{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.l-cysteine-sulphinic-acid","code":"thing-q2823252","url":"https://ver.cy/models/thing/q2823252/","name":"L-cysteine sulphinic acid","alternateNames":["2-amino-3-sulfinopropanoic acid"],"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-cysteine sulphinic acid is a sulfur-containing L-α-amino acid with the structure HOOC-CH(NH2)-CH2-S(O)OH, formed by oxidation of L-cysteine and serving as an intermediate in cysteine metabolism and taurine biosynthesis.","purpose":"Enable an AI agent to recognise L-cysteine sulphinic acid, assess the identity and condition of a sample, and determine its suitability for a specified analytical or biochemical use.","scope":{"in":["Molecular identity, L stereochemistry and sulphinic-acid functionality","Free-acid, ionisation, hydration and counterion distinctions relevant to sample identity","Chemical purity, enantiomeric composition and concentration","Physical condition, solution behaviour and evidence of degradation","Biochemical relationships and evidence supporting intended laboratory uses","Form-specific safety information and regulatory identifiers"],"out":["L-cysteine and other sulfur oxidation products as independently modelled substances","Protein-bound cysteine sulphinic-acid residues as complete proteins or peptides","Commercial formulations, packaging and supplier organisations","Complete metabolic pathways and the enzymes that catalyse their reactions","Manufacturing processes and laboratory instruments","Clinical treatment protocols or inferred therapeutic efficacy"],"boundaries":[]},"distinguishingFeatures":["Match the free-acid identity to C3H7NO4S, CAS 1115-65-7 and PubChem CID 1549098, while checking that the source record represents the L compound. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/L-Cysteinesulfinic-acid)","Verify the L configuration at the amino-acid stereocentre; the corresponding systematic name is (2R)-2-amino-3-sulfinopropanoic acid. Formula and ordinary mass measurements alone do not establish this distinction. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/L-Cysteinesulfinic-acid)","Require structural evidence for the side-chain sulphinic-acid group, distinguishing it from the thiol of cysteine and from neighbouring sulfur oxidation states.","Establish whether the material is the free amino acid or a cysteine-derived residue covalently incorporated into a peptide.","Check declared hydration and counterions before treating a supplied material as equivalent to the reference free acid for weighing or concentration calculations."],"structure":{"bundles":[{"id":"chemical-identity-and-boundaries","name":"Chemical identity and boundaries","description":"Recognise the specific L amino acid and prevent confusion with closely named sulfur compounds.","layers":[{"id":"structure-and-stereochemistry","name":"Structure and stereochemistry","description":"Establish connectivity and the amino-acid stereocentre.","findings":[{"id":"l-sulphinic-acid-identity","name":"L sulphinic-acid identity","description":"Record evidence that both the sulphinic-acid functionality and L configuration belong to the material being identified.","questions":[{"text":"What structural evidence establishes the sulphinic-acid side chain rather than another sulfur-containing group?","id":"l-sulphinic-acid-identity-q01","kind":"definition"},{"text":"What chiral measurement or traceable reference establishes the L configuration and limits the D fraction?","id":"l-sulphinic-acid-identity-q02","kind":"measurement"}]}]},{"id":"identifier-and-entity-matching","name":"Identifier and entity matching","description":"Resolve names and external records against the registry boundary.","findings":[{"id":"equivalent-name-boundary","name":"Equivalent-name boundary","description":"Treat spelling variants as candidate synonyms while checking whether each record describes the free compound, a supplied form or a covalently bound residue.","questions":[{"text":"Which authoritative records connect the sulphinic and sulfinic spellings to this exact stereochemical identity?","id":"equivalent-name-boundary-q01","kind":"provenance"},{"text":"Does the encountered name denote the free amino acid, a salt or hydrate, a racemate, or a peptide-bound residue?","id":"equivalent-name-boundary-q02","kind":"boundary"}]}]}]},{"id":"material-form-and-amount","name":"Material form and amount","description":"Connect the molecular reference identity to the material actually weighed or dissolved.","layers":[{"id":"solid-form-and-composition","name":"Solid form and composition","description":"Establish the composition basis of a supplied solid.","findings":[{"id":"hydration-and-assay-basis","name":"Hydration and assay basis","description":"Require water content, counterion information and assay basis before converting sample mass into analyte amount.","questions":[{"text":"What evidence establishes hydration, counterions and any residual solvent in this lot?","id":"hydration-and-assay-basis-q01","kind":"measurement"},{"text":"Is the reported assay expressed as supplied, on a dry basis or as free-acid equivalent?","id":"hydration-and-assay-basis-q02","kind":"definition"}]}]},{"id":"solution-speciation-and-solubility","name":"Solution speciation and solubility","description":"Describe dissolved material under explicit chemical and physical conditions.","findings":[{"id":"conditioned-solution-properties","name":"Conditioned solution properties","description":"Record solubility and ionisation evidence with pH, solvent and temperature instead of assigning universal solution behaviour.","questions":[{"text":"What concentration is demonstrably dissolved in the specified solvent at the recorded pH and temperature?","id":"conditioned-solution-properties-q01","kind":"measurement"},{"text":"Which measured or sourced acid-base data support the assigned solution species?","id":"conditioned-solution-properties-q02","kind":"provenance"},{"text":"What material-form and assay corrections are required to prepare the intended concentration?","id":"conditioned-solution-properties-q03","kind":"action"}]}]}]},{"id":"analytical-quality-and-stability","name":"Analytical quality and stability","description":"Determine whether a sample contains the intended compound at an acceptable quality and remains suitable over time.","layers":[{"id":"related-compound-discrimination","name":"Related-compound discrimination","description":"Assess analytical separation and identification of plausible confounders.","findings":[{"id":"selective-analyte-assay","name":"Selective analyte assay","description":"Require an assay capable of distinguishing the target from relevant related compounds; assess stereochemistry separately where necessary.","questions":[{"text":"Does the method distinguish L-cysteine sulphinic acid from cysteine, cysteic acid and other relevant sample components?","id":"selective-analyte-assay-q01","kind":"measurement"},{"text":"What reference materials, detection limits and response corrections support the reported purity?","id":"selective-analyte-assay-q02","kind":"provenance"}]}]},{"id":"storage-and-preparation-history","name":"Storage and preparation history","description":"Relate current analytical condition to handling and elapsed time.","findings":[{"id":"evidence-based-retest","name":"Evidence-based retest","description":"Base storage limits and retesting decisions on evidence for the relevant solid or solution form.","questions":[{"text":"How have analyte content and related-compound levels changed under the recorded storage or solution conditions?","id":"evidence-based-retest-q01","kind":"measurement"},{"text":"What evidence supports the permissible preparation age and the decision to use, retest or reject this sample?","id":"evidence-based-retest-q02","kind":"action"}]}]}]},{"id":"biochemical-context-and-use","name":"Biochemical context and use","description":"Connect the free compound to biochemical reactions and experimental observations.","layers":[{"id":"reaction-participation","name":"Reaction participation","description":"Record supported formation and consumption relationships.","findings":[{"id":"supported-metabolic-links","name":"Supported metabolic links","description":"Represent reaction participation through identified substrates, products and catalysts rather than treating a pathway label as proof.","questions":[{"text":"Which primary evidence establishes formation or consumption of this compound in the specified organism or enzyme system?","id":"supported-metabolic-links-q01","kind":"provenance"},{"text":"How was the free compound distinguished from other sulfur metabolites or oxidised peptide residues?","id":"supported-metabolic-links-q02","kind":"boundary"}]}]},{"id":"experimental-role-and-interpretation","name":"Experimental role and interpretation","description":"Determine what an assay using or detecting this compound can establish.","findings":[{"id":"use-specific-acceptance","name":"Use-specific acceptance","description":"Connect reagent quality, concentration and controls to the intended biochemical endpoint.","questions":[{"text":"What role does the compound have in this experiment: analyte, calibration material, substrate or applied test substance?","id":"use-specific-acceptance-q01","kind":"definition"},{"text":"Which purity, stereochemical, concentration and control requirements must be met before interpreting the endpoint?","id":"use-specific-acceptance-q02","kind":"action"}]}]}]},{"id":"handling-and-regulatory-evidence","name":"Handling and regulatory evidence","description":"Associate handling decisions and regulatory identity with the exact material and jurisdiction.","layers":[{"id":"form-specific-safety","name":"Form-specific safety","description":"Assess whether available hazard and handling evidence applies to the sample.","findings":[{"id":"applicable-safety-record","name":"Applicable safety record","description":"Keep safety classifications and handling instructions traceable to the represented form and source revision.","questions":[{"text":"Which current safety data sheet matches this sample's chemical identity, hydration and formulation?","id":"applicable-safety-record-q01","kind":"provenance"},{"text":"What handling and disposal measures does that evidence support for the intended quantity and operation?","id":"applicable-safety-record-q02","kind":"action"}]}]},{"id":"jurisdiction-and-data-gaps","name":"Jurisdiction and data gaps","description":"Separate established identifiers and restrictions from unresolved regulatory information.","findings":[{"id":"verified-regulatory-status","name":"Verified regulatory status","description":"Record jurisdiction-specific identifiers, classifications and limits only when their applicability is established.","questions":[{"text":"Which official records verify the applicable EC or inventory identifier and classification for this exact substance?","id":"verified-regulatory-status-q01","kind":"provenance"},{"text":"Is any exposure limit substance-specific, a general limit applicable to the operation, or still unverified?","id":"verified-regulatory-status-q02","kind":"boundary"}]}]}]},{"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-cysteine sulphinic acid 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-cysteine sulphinic acid 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-cysteine sulphinic acid 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-cysteine sulphinic acid 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-cysteine sulphinic acid this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of L-cysteine sulphinic acid this model covers, and on what evidence?","id":"evidence-regional-variation-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-cysteine sulphinic acid this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe L-cysteine sulphinic acid and its role in cysteine metabolism and taurine synthesis from reliable sources.","Record its use and storage in a laboratory the agent is authorized to manage."],"mustNot":["Present it as a supplement or treatment without clinical evidence.","Diagnose a metabolic disorder in a particular person from metabolite results.","Confuse it with similarly named sulfur compounds in records or orders."],"requiresHuman":["Interpreting a patient's metabolic test results."]},"ethics":{"considerations":["Metabolic research can be overstated into health claims that mislead patients."],"affectedParties":["Researchers and students","Patients with metabolic disorders"]},"owners":{"steward":"Nobody owns the compound; the laboratory that holds a sample answers for it.","roles":[],"masterSystems":["Chemical inventories and safety data sheet systems"]},"relations":[{"target":"Q11173","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.l-cysteine-sulphinic-acid","Wikidata: Q2823252 (https://www.wikidata.org/wiki/Q2823252)"]},"properties":{"applicability":"required","items":["Reference chemical identity: L-cysteine sulphinic acid; L-cysteinesulfinic acid; 3-sulfino-L-alanine","Reference formula and molar mass: C3H7NO4S; 153.16 g/mol for the reference free acid","Enantiomeric composition: L fraction or enantiomeric excess in %, with analytical method","Material form: Free acid, hydrate, counterion-containing form or solution; stoichiometry where established","Chemical assay and impurity profile: Mass fraction or molar fraction; named impurities; method and reporting basis","Water content: Mass % or mol H2O/mol compound, with method","Solution condition: Solvent, pH, temperature, concentration, preparation time and observed precipitation","Thermal behaviour: Transition or decomposition temperature in °C, with method and material form","Storage and degradation status: Storage history, retest date, related-compound changes and acceptance decision","Biochemical role evidence: Compound linked to reaction, enzyme or assay endpoint, with organism and conditions","Applicable safety classification: Verified classification, jurisdiction, material form, source date or unresolved"]},"recognition":{"applicability":"required","items":["A sample label should explicitly identify L-cysteine sulphinic acid, since appearance alone cannot distinguish it from similar laboratory chemicals.","The identity documentation should specify the L form and the sulphinic acid group, distinguishing it from unspecified stereochemical forms and more highly oxidized cysteic acid."]},"capabilities":{"applicability":"required","items":["Resolve chemical synonyms and identifiers while flagging stereochemical or material-form mismatches.","Assess whether identity, purity and water-content evidence support an intended use.","Calculate weighed amounts or solution concentrations using the verified material form and assay basis.","Select analytical checks that distinguish the target from related sulfur compounds and stereoisomers.","Evaluate whether a stored solid or prepared solution needs retesting before use.","Associate biochemical observations and handling decisions with their supporting evidence and conditions."]},"hazards":{"applicability":"required","items":["Confusion with related sulfur amino acids can corrupt experimental records."]},"interfaces":{"applicability":"required","items":["The Globally Harmonized System of Classification and Labelling of Chemicals, issued by the United Nations, provides the framework for evaluating hazards and communicating any applicable classifications for supplied L-cysteine sulphinic acid materials."]},"context":{"applicability":"required","items":["L-cysteine sulphinic acid is encountered in biochemical studies of sulfur amino acid metabolism and taurine biosynthesis.","It is used as a research material or analytical reference when investigating enzymes and metabolites associated with cysteine oxidation."]}},"sources":[{"title":"Wikidata item Q2823252: L-cysteine sulphinic acid","url":"https://www.wikidata.org/wiki/Q2823252","note":"identity and sense of the item"},{"title":"Wikipedia: Cysteine sulfinic acid","url":"https://en.wikipedia.org/wiki/Cysteine_sulfinic_acid","note":"general description of the item"}],"openQuestions":["Which hydrate or salt forms are documented, and what water-content and assay corrections are justified for each?","What reliable measurements establish pKa values, condition-specific solubility and thermal behaviour, including whether decomposition precludes a meaningful boiling point?","What degradation products and rates occur under relevant solid-storage and aqueous-assay conditions?","Which validated methods best separate the target from related sulfur compounds and independently quantify its enantiomeric composition?","Which current official identifiers, hazard classifications and exposure limits apply to the exact material in the intended jurisdiction?"],"resources":{"spec":"/models/things/publications/thing-q2823252/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q2823252/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T10:50:20Z","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":"filled","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"},"score":1.0}}