Official EU label nameGlossary entry 1678

AMIDINOCYSTEINE

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

0 markets with evidence

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Markets with evidence

Evidence gaps

Resolved identifiers

Resolved substance identity

CAS:40454-21-5

EC:254-925-1

Ingredient index records:

AMIDINOCYSTEINE

Cosmetic functions: HAIR WAVING OR STRAIGHTENING

2-Guanidino-3-mercaptopropionic acid

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1 matched or reported name

AMIDINOCYSTEINE

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name AMIDINOCYSTEINE.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 40454-21-5

CAS 40454-21-5PubChem CID 38477

N-(Aminoiminomethyl)-L-cysteine

IUPAC name: (2R)-2-(diaminomethylideneamino)-3-sulfanylpropanoic acid

Molecular formula: C4H9N3O2S
Molecular weight: 163.20 g/mol
Exact mass: 163.04154771 Da
XLogP3: -1.2
Topological polar surface area: 103.0 Å²
Hydrogen-bond donors: 4
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 1

Also known as

IQB-782n-guanylcysteineL-Cysteine, N-(aminoiminomethyl)-N-Guanidine-beta-mercaptoalanine48PVL851IDRefChem:926937N-Amidino-L-cysteineGUANYL-CYS-OH

16 more reported names

N-Guanyl-cysteineamidinocysteineN-AmidinocysteineIqb 782EINECS 254-925-1N-GUANYL-L-CYSTEINEBRN 2087654UNII-48PVL851IDCYSTEINE, N-AMIDINO-, L-CYSTEINE, N-AMIDINO-XWRZKLKALVJDDS-REOHCLBHSA-NN-(Diaminomethylidene)-L-cysteineDA-54366HY-1059402-GUANIDINO-3-MERCAPTOPROPIONIC ACIDCS-0026990

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External database identifiers

EPA DTXSID:DTXSID90193470

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Additional authoritative substance research

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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