{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.l-fucitol","code":"thing-q3090510","url":"https://ver.cy/models/thing/q3090510/","name":"L-fucitol","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"L-fucitol is the six-carbon deoxy sugar alcohol formed by reduction of the aldehyde group of L-fucose to a primary alcohol, retaining the configuration of its existing stereocentres.","purpose":"Enable an agent to identify L-fucitol, assess the identity and condition of a sample, and determine whether it is suitable for a specified analytical or chemical use.","scope":{"in":["Molecular identity, absolute stereochemistry and verified identifiers","Distinction from L-fucose, D-fucitol and other deoxyhexitols","Chemical purity, stereochemical purity and preparation-related impurities","Physical state and measured properties under stated conditions","Analytical identification, chemical transformations and evidence supporting permitted uses","Substance-specific hazard and regulatory evidence"],"out":["L-fucose as a separately registered sugar","D-fucitol and other stereoisomers as independent substances","Derivatized fucitol compounds as independent chemical identities","Complete manufacturing processes and reactor operation","Products, formulations and organisms containing L-fucitol"],"boundaries":[]},"distinguishingFeatures":["Match the stereochemically specified structure (2R,3S,4R,5S)-hexane-1,2,3,4,5-pentol, rather than accepting the name fucitol alone. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/L-Fucitol)","Confirm a six-carbon pentol with one methyl terminus and one hydroxymethyl terminus; distinguish this reduced structure from the carbonyl or cyclic hemiacetal forms of L-fucose.","Use stereochemically discriminating evidence to distinguish L-fucitol from D-fucitol; molecular formula and ordinary mass measurement do not establish the enantiomer.","Distinguish unmodified L-fucitol from its pentakis(trimethylsilyl) ether when interpreting derivatized analytical samples. [NIST derivative record](https://webbook.nist.gov/cgi/inchi?ID=U380137)"],"structure":{"bundles":[{"id":"chemical-identity","name":"Chemical identity","description":"Establish what counts as L-fucitol and how its identity survives changes in naming and numbering.","layers":[{"id":"connectivity-and-configuration","name":"Connectivity and configuration","description":"Define the pentol skeleton and its four stereocenters.","findings":[{"id":"structure-based-identity","name":"Structure-based identity","description":"Recognition requires both the deoxyhexitol connectivity and the specified absolute configuration.","questions":[{"text":"Does the structure contain the expected methyl and hydroxymethyl termini and five hydroxyl groups?","id":"structure-based-identity-q01","kind":"definition"},{"text":"What evidence establishes the absolute configuration rather than only the molecular formula or relative stereochemistry?","id":"structure-based-identity-q02","kind":"provenance"}]}]},{"id":"names-and-neighbours","name":"Names and neighbours","description":"Resolve synonyms and exclude related sugars, stereoisomers and derivatives.","findings":[{"id":"identifier-reconciliation","name":"Identifier reconciliation","description":"Names and identifiers must resolve to the same stereochemically explicit structure before records are combined.","questions":[{"text":"Does each cited identifier resolve specifically to L-fucitol rather than unspecified fucitol or D-fucitol?","id":"identifier-reconciliation-q01","kind":"provenance"},{"text":"Does the record describe unmodified L-fucitol, L-fucose, a mixture or a covalent derivative?","id":"identifier-reconciliation-q02","kind":"boundary"}]}]}]},{"id":"sample-composition-and-authentication","name":"Sample composition and authentication","description":"Determine whether a physical sample contains the intended substance at the required chemical and stereochemical purity.","layers":[{"id":"analytical-identity","name":"Analytical identity","description":"Combine evidence for molecular structure with evidence capable of distinguishing stereoisomers.","findings":[{"id":"complementary-identification","name":"Complementary identification","description":"Analytical acceptance must state which identity ambiguities each method resolves.","questions":[{"text":"Which NMR, mass-spectrometric or other observations support the L-fucitol skeleton, and what alternatives remain unresolved?","id":"complementary-identification-q01","kind":"measurement"},{"text":"Which validated chiral method or traceable stereochemical evidence distinguishes the sample from D-fucitol?","id":"complementary-identification-q02","kind":"measurement"}]}]},{"id":"assay-and-impurities","name":"Assay and impurities","description":"Quantify L-fucitol content and impurities relevant to its preparation and intended use.","findings":[{"id":"use-relevant-composition","name":"Use-relevant composition","description":"Preparation history guides impurity testing without establishing purity by itself.","questions":[{"text":"What are the measured assay, water content and stereoisomer profile, and on what reporting basis?","id":"use-relevant-composition-q01","kind":"measurement"},{"text":"If the material was prepared by reducing L-fucose, what evidence excludes unacceptable residual L-fucose and route-specific reagent or catalyst residues?","id":"use-relevant-composition-q02","kind":"provenance"}]}]}]},{"id":"physical-state-and-preparation","name":"Physical state and preparation","description":"Record the sample conditions that govern weighing, dissolution and comparison with measured properties.","layers":[{"id":"solid-and-thermal-state","name":"Solid and thermal state","description":"Connect observed solid condition and thermal behavior to the characterized sample.","findings":[{"id":"conditioned-property-record","name":"Conditioned property record","description":"Thermal measurements need sample provenance and conditions before they can support an acceptance decision.","questions":[{"text":"What melting interval or decomposition behavior was measured, using which method and sample pretreatment?","id":"conditioned-property-record-q01","kind":"measurement"},{"text":"Do drying history, residual solvent or observed solid-form differences explain disagreement with a reference measurement?","id":"conditioned-property-record-q02","kind":"provenance"}]}]},{"id":"solution-preparation","name":"Solution preparation","description":"Determine achievable concentration and actual L-fucitol content in a prepared solution.","findings":[{"id":"concentration-and-solubility","name":"Concentration and solubility","description":"A weighed amount becomes a reliable solution concentration only when composition, dissolution and preparation conditions are accounted for.","questions":[{"text":"What solubility evidence supports the target concentration in the chosen solvent at the preparation and use temperatures?","id":"concentration-and-solubility-q01","kind":"measurement"},{"text":"How should the weighed mass be corrected for assay and water content, and how will complete dissolution be verified?","id":"concentration-and-solubility-q02","kind":"action"}]}]}]},{"id":"transformations-and-use-decisions","name":"Transformations and use decisions","description":"Connect L-fucitol to analytical derivatives, chemical transformations and evidence governing a proposed use.","layers":[{"id":"reaction-and-derivative-boundaries","name":"Reaction and derivative boundaries","description":"Preserve substance identity when L-fucitol is produced, consumed or derivatized.","findings":[{"id":"parent-product-traceability","name":"Parent-product traceability","description":"Derivative measurements and transformation records must identify the parent substance separately from the products actually observed.","questions":[{"text":"Does the analytical signal represent unmodified L-fucitol or a named derivative, and what validates its assignment to the parent?","id":"parent-product-traceability-q01","kind":"boundary"},{"text":"What evidence establishes conversion, product identity and stereochemical outcome for a proposed reduction, oxidation or derivatization?","id":"parent-product-traceability-q02","kind":"action"}]}]},{"id":"handling-and-use-evidence","name":"Handling and use evidence","description":"Evaluate sample-specific handling information and the evidence needed for the intended application.","findings":[{"id":"evidence-limited-use","name":"Evidence-limited use","description":"Suitability depends on the intended use, sample quality and applicable evidence; a chemical identity record alone does not establish it.","questions":[{"text":"Which current safety data and jurisdiction-specific records apply to this L-fucitol identity, grade and physical presentation?","id":"evidence-limited-use-q01","kind":"provenance"},{"text":"What purity, stability and qualification evidence is required before this sample can serve the proposed analytical, synthetic or biological purpose?","id":"evidence-limited-use-q02","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of L-fucitol this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of L-fucitol this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of L-fucitol this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of L-fucitol this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of L-fucitol this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of L-fucitol this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe L-fucitol as the sugar alcohol of L-fucose from reliable chemical sources.","Track samples in an authorized laboratory inventory with label and source."],"mustNot":["Report the identity, stereochemistry or purity of a sample without analysis.","Confuse it with other deoxy sugar alcohols in records or orders.","Present it as a sweetener or supplement with health benefits without evidence."],"requiresHuman":["Supplying it for use in food or tests on people."]},"ethics":{"considerations":["Research results depend on reagents being exactly what their labels say.","Novel food uses require safety evidence before people consume them."],"affectedParties":["Researchers","Consumers of novel food ingredients"]},"owners":{"steward":"Nobody owns the compound; the laboratory or supplier answers for each sample.","roles":[],"masterSystems":[]},"relations":[{"target":"Q105254737","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.l-fucitol","Wikidata: Q3090510 (https://www.wikidata.org/wiki/Q3090510)"]},"properties":{"applicability":"required","items":["Molecular composition: C6H14O5; molar mass 166.17 g/mol","Absolute configuration: (2R,3S,4R,5S), using hexane-1,2,3,4,5-pentol numbering","Identifier mapping: vr.tr.l-fucitol; PubChem CID 445724; reported CAS 13074-06-1","Chemical assay: Mass fraction % or mol fraction %, with method, uncertainty and as-received or dry basis","Stereochemical purity: L-fucitol fraction among stereoisomers; enantiomeric excess % where applicable","Water and residual solvent content: Water mass %; named residual solvents in mg/kg","Physical presentation: Observed solid form or solution; temperature in °C; solvent and concentration when dissolved","Thermal behavior: Melting interval and decomposition onset in °C, with method and sample history","Solubility: g/L or mol/L in a named solvent at a stated temperature","Hazard and regulatory evidence: Jurisdiction, source date, applicable classification and use restrictions; unknown when unverified"]},"recognition":{"applicability":"required","items":["Usually a white crystalline solid in a labelled vial; identity needs analysis."]},"capabilities":{"applicability":"required","items":["Reconcile a supplier label or database record against the stereochemically defined L-fucitol identity.","Select complementary methods to assess connectivity, stereochemistry and sample purity.","Calculate a standard-solution concentration using measured assay and water content.","Assess whether a sample meets the purity and physical-condition requirements of a specified experiment.","Track reduction, oxidation or derivatization through explicit relationships between L-fucitol and distinct precursor or product identities.","Determine handling and use conditions from applicable evidence, leaving unsupported decisions unresolved."]},"hazards":{"applicability":"required","items":["Confusion with stereoisomers leads to wrong experimental results."]},"interfaces":{"applicability":"not-applicable","items":[]},"context":{"applicability":"required","items":["L-fucitol is encountered in carbohydrate chemistry as the sugar alcohol corresponding to L-fucose.","Research laboratories may use authenticated material in studies of deoxy sugars or as an analytical reference when the method specifically requires L-fucitol."]}},"sources":[{"title":"Wikidata item Q3090510: L-fucitol","url":"https://www.wikidata.org/wiki/Q3090510","note":"identity and sense of the item"},{"title":"Wikipedia: Fucitol","url":"https://en.wikipedia.org/wiki/Fucitol","note":"general description of the item"}],"openQuestions":["Which primary measurements establish reliable melting behavior, solvent-dependent solubility and storage stability for authenticated L-fucitol?","Which validated method distinguishes L-fucitol from D-fucitol and relevant diastereomers at the impurity levels required by the intended use?","What EC identifier, GHS classification, exposure limits and jurisdiction-specific restrictions, if any, are verified for this exact substance?","Which preparation routes and commercial grades are relevant, and what residual sugars, reagents, solvents or catalysts require acceptance limits?","Which reported natural occurrences or biological activities are supported by primary studies that authenticate L-fucitol specifically?"],"resources":{"spec":"/models/things/publications/thing-q3090510/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q3090510/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T10:50:15Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"not-applicable","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:29+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.interfaces":"No compound-specific standard or official classification is identified here, and applicable chemical requirements depend on jurisdiction and use."},"score":1.0}}