{ "model": { "rank": 16549, "code": "thing-q41088690", "model_id": "vr.tr.isomerism", "name": "isomerism", "purpose": "Let an agent explain isomerism and its kinds, distinguish structural from stereoisomerism and configuration descriptors, relay its importance in chemistry, biology and pharmacology, and help classify a given pair of compounds.", "family": "Thing Registry", "category": "Cross-cutting context", "status": "research-draft", "kind": "thing", "plane": "XCT", "domain": "XCT.STA", "industry": "", "version": "", "url": "/models/thing/q41088690/", "tier": 2, "score": 32, "payload": { "layer": "wikidata", "aliases": [ "relative stereochemistry", "absolute configuration", "structural isomerism", "stereoisomerism", "endo–exo isomerism", "coordination isomerism", "diastereoisomerism", "enantiomerism" ], "aliasCount": 8, "merged": 8, "knownIn": 32, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": "vr.tr.isomerism", "source": { "dataset": "wikidata", "item": "Q41088690", "url": "https://www.wikidata.org/wiki/Q41088690", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T22:45:35Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 3, "engine": "claude" }, "metaModel": { "id": "THING-Q41088690", "registryId": "vr.tr.isomerism", "name": "isomerism", "version": "0.2.0-wave.3", "entryKind": "thing", "family": "Thing Registry", "domain": [ "XCT.STA" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q41088690/", "model": { "registry_id": "vr.tr.isomerism", "name": "isomerism", "purpose": "Let an agent explain isomerism and its kinds, distinguish structural from stereoisomerism and configuration descriptors, relay its importance in chemistry, biology and pharmacology, and help classify a given pair of compounds.", "definition": "The relation between compounds that have the same molecular formula but different arrangements of atoms, and the property of existing in such forms; isomerism divides into structural isomerism, where atoms are connected differently, and stereoisomerism, where the same connections differ in spatial arrangement, including enantiomers and diastereomers described by absolute and relative configuration, and special cases such as endo-exo isomerism and coordination isomerism in complexes.", "what_it_is_for": "Understanding how compounds with the same formula differ.", "affordances": [ "explain kinds of isomerism", "explain configuration descriptors", "relay importance in drugs and biology", "help classify isomer pairs" ], "distinguishing_features": [ "Same molecular formula", "Different connectivity or geometry", "Absolute and relative configuration", "Property differences" ], "appearance": "Not a visible object; structural diagrams showing different arrangements of the same atoms.", "visual_identification": [ "Same formula, different arrangement", "Structural and stereoisomers", "Allotropes are forms of an element; conformers differ by rotation and are usually not counted as isomers" ], "physical_properties": [], "families_and_kinds": [ "structural isomerism: chain, position and functional group", "stereoisomerism: enantiomers and diastereomers", "cis-trans and endo-exo isomerism", "coordination, linkage and ionisation isomerism in complexes", "tautomerism as a related dynamic case" ], "related_models": [ { "relation": "is a kind of", "target": "relation", "why": "in registry terms" }, { "relation": "is a kind of", "target": "property", "why": "in registry terms" }, { "relation": "includes", "target": "stereoisomerism", "why": "a major kind" }, { "relation": "is described by", "target": "CIP priority rules", "why": "for absolute configuration" } ], "identifiers": [ { "scheme": "descriptors", "value_or_pattern": "R, S, E, Z, cis, trans", "note": "IUPAC stereodescriptors" } ], "standards_and_regulation": [ "IUPAC nomenclature and stereochemistry recommendations", "Regulatory requirements for single-enantiomer drugs" ], "failure_modes_and_hazards": [ "Confusing kinds of isomerism", "Different biological effects of isomers, as in thalidomide", "Errors in configuration assignment" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "define", "name": "Define", "description": "What isomerism is.", "rationale": "Definition.", "layers": [ { "id": "definition", "name": "Definition", "description": "Definition and kinds.", "findings": [ { "id": "definition-finding", "name": "Definition", "description": "Definition.", "questions": [ { "text": "What is isomerism, and what kinds exist?", "kind": "definition" }, { "text": "Are the compounds in question isomers, and of which kind?", "kind": "boundary" } ] } ] }, { "id": "stereo", "name": "Stereo", "description": "Stereoisomerism.", "findings": [ { "id": "stereo-finding", "name": "Stereo", "description": "Stereo.", "questions": [ { "text": "How do enantiomers and diastereomers differ, and what are absolute and relative configuration?", "kind": "definition" }, { "text": "Which entry fits chirality?", "kind": "action" } ] } ] } ] }, { "id": "classify", "name": "Classify", "description": "Classifying isomers.", "rationale": "Computation.", "layers": [ { "id": "assign", "name": "Assign", "description": "Assigning descriptors.", "findings": [ { "id": "assign-finding", "name": "Assign", "description": "Assign.", "questions": [ { "text": "How are R, S, E and Z descriptors assigned using priority rules?", "kind": "action" }, { "text": "What descriptors apply to the compound in question?", "kind": "measurement" } ] } ] }, { "id": "count", "name": "Count", "description": "Counting isomers.", "findings": [ { "id": "count-finding", "name": "Count", "description": "Count.", "questions": [ { "text": "How many isomers does a given formula or structure have?", "kind": "action" }, { "text": "Which entry fits the specific isomer class?", "kind": "action" } ] } ] } ] }, { "id": "matter", "name": "Matter", "description": "Why it matters.", "rationale": "Application.", "layers": [ { "id": "pharma", "name": "Pharma", "description": "Drugs and biology.", "findings": [ { "id": "pharma-finding", "name": "Pharma", "description": "Pharma.", "questions": [ { "text": "Why do isomers differ in biological activity, and how do regulators treat single enantiomers?", "kind": "provenance" }, { "text": "Which entry fits chiral drug?", "kind": "action" } ] } ] }, { "id": "materials", "name": "Materials", "description": "Materials and complexes.", "findings": [ { "id": "materials-finding", "name": "Materials", "description": "Materials.", "questions": [ { "text": "How does isomerism affect materials and coordination compounds?", "kind": "provenance" }, { "text": "Which references are standard?", "kind": "provenance" } ] } ] } ] }, { "id": "context", "name": "Context", "description": "History and teaching.", "rationale": "Context.", "layers": [ { "id": "history", "name": "History", "description": "History.", "findings": [ { "id": "history-finding", "name": "History", "description": "History.", "questions": [ { "text": "How was isomerism discovered by Berzelius, Pasteur, van t Hoff and Le Bel?", "kind": "provenance" }, { "text": "Which entry fits the history of chemistry?", "kind": "action" } ] } ] }, { "id": "teach", "name": "Teach", "description": "Teaching.", "findings": [ { "id": "teach-finding", "name": "Teach", "description": "Teaching.", "questions": [ { "text": "How is isomerism taught, and which misconceptions arise?", "kind": "provenance" }, { "text": "Which sources are cited?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Should stereoisomerism be a separate primary entry?", "How should IUPAC recommendations be linked?", "The registry entry has merged aliases naming kinds and descriptors; should they be split off?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "abstract concept", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a isomerism, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent explain isomerism and its kinds, distinguish structural from stereoisomerism and configuration descriptors, relay its importance in chemistry, biology and pharmacology, and help classify a given pair of compounds.", "characteristics": { "substance": "abstract", "origin": "conceptual", "agency": "inert" }, "whatYouCanDoWithIt": [ "observed and measured" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: relative stereochemistry, absolute configuration, structural isomerism, stereoisomerism, endo–exo isomerism, coordination isomerism, diastereoisomerism, enantiomerism.", "8 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 32 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a isomerism, and on what evidence are they told apart?" ], "whatItIsMadeOf": "an abstraction with no physical instance", "physicalCharacter": [ "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state" ], "howItIsRecognised": [ "Nothing to see. What is recognised is an instance of it, and which instances count is exactly what is argued about." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "relative stereochemistry", "absolute configuration", "structural isomerism", "stereoisomerism", "endo–exo isomerism", "coordination isomerism", "diastereoisomerism", "enantiomerism" ] } ], "standing": "Described in 32 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 8 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one isomerism from another, and a isomerism from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a isomerism, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a isomerism, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a isomerism is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a isomerism, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a isomerism, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a isomerism is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a isomerism sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a isomerism, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a isomerism, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a isomerism is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a isomerism from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a isomerism, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a isomerism, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a isomerism is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a isomerism passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a isomerism between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a isomerism, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a isomerism, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a isomerism is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a isomerism, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a isomerism is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a isomerism, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a isomerism, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a isomerism is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "definitions-in-contest", "name": "Definitions and who holds them", "description": "What isomerism is taken to mean, and by whom.", "rationale": "When a field disagrees about a concept, the disagreement is the content. A model that picks one definition silently destroys the information.", "layers": [ { "id": "competing-definitions", "name": "Competing definitions", "description": "The main readings and the traditions behind them.", "findings": [ { "id": "definition-map", "name": "Definitions and their holders", "description": "Each definition with the school or body that holds it.", "questions": [ { "id": "definition-map-q01", "text": "Which definitions of isomerism are in use, and which tradition or body holds each?", "kind": "definition" }, { "id": "definition-map-q02", "text": "What turns on the difference between them in practice?", "kind": "boundary" } ] } ] }, { "id": "operationalisation", "name": "Operationalisation", "description": "How it is measured or applied when it has to be.", "findings": [ { "id": "operational-record", "name": "Measures and proxies", "description": "Instruments and indicators used to stand in for it.", "questions": [ { "id": "operational-record-q01", "text": "How is isomerism operationalised or measured in practice, and by what instrument?", "kind": "measurement" }, { "id": "operational-record-q02", "text": "What does that operationalisation leave out, and when does that matter?", "kind": "boundary" } ] } ] } ] }, { "id": "instances-and-use", "name": "Instances, use and consequence", "description": "What counts as an instance of isomerism and what follows from calling something that.", "rationale": "Applying a concept is an act with consequences, so a model must say what the label licenses and what it does not.", "layers": [ { "id": "instances", "name": "What counts as an instance", "description": "Clear cases, borderline cases and non-cases.", "findings": [ { "id": "instance-tests", "name": "Tests for an instance", "description": "What would settle whether something falls under it.", "questions": [ { "id": "instance-tests-q01", "text": "What would settle whether something is an instance of isomerism?", "kind": "boundary" }, { "id": "instance-tests-q02", "text": "Which borderline cases are argued about, and on what grounds?", "kind": "definition" } ] } ] }, { "id": "consequence", "name": "Consequence of application", "description": "Rights, duties or decisions that follow from the label.", "findings": [ { "id": "consequence-record", "name": "What the label licenses", "description": "What an agent may do once something is classified this way.", "questions": [ { "id": "consequence-record-q01", "text": "What follows practically once something is treated as isomerism?", "kind": "action" }, { "id": "consequence-record-q02", "text": "What must an agent not infer from the label alone?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a isomerism came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a isomerism and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a isomerism, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a isomerism, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a isomerism is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a isomerism is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a isomerism, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a isomerism, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a isomerism is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 5, "layers": 10, "findings": 12, "questions": 32 } } } }