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CAS 21593-77-1 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

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InventoryRef 9598118/04/2018

S-ALLYLCYSTEINE

L-Cysteine, S-2-propen-1-yl-

S-ALLYLCYSTEINE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 21593-77-1

CAS 21593-77-1PubChem CID 9793905

(+)-S-Allylcysteine

S-allylcysteine is an S-hydrocarbyl-L-cysteine that is L-cysteine in which the hydrogen attached to the sulphur is replaced by a prop-2-enyl group. It commonly occurs in garlic and has been found to exhibit antineoplastic activity. It has a role as a metabolite and an antineoplastic agent. It is a tautomer of a S-allylcysteine zwitterion. — ChEBI

IUPAC name: (2R)-2-amino-3-prop-2-enylsulfanylpropanoic acid

Molecular formula: C6H11NO2S
Molecular weight: 161.22 g/mol
Exact mass: 161.05104977 Da
XLogP3: -2.1
Topological polar surface area: 88.6 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 1

Also known as

S-allyl-L-cysteineS-AllylcysteineS-Allyl cysteineL-Cysteine, S-2-propenyl-CHEBI:7407781R3X99M15FEMA NO. 4322NSC-96449

16 more reported names

(2R)-2-AMINO-3-(PROP-2-EN-1-YLSULFANYL) PROPANOIC ACIDRefChem:48874(2R)-2-azaniumyl-3-prop-2-enylsulfanylpropanoate2-amino-3-(prop-2-en-1-ylsulfanyl)propanoic acid(R)-3-(Allylthio)-2-aminopropanoic acidL-DEOXYALLIINDEOXYALLIINallyl-cysteineS-prop-2-en-1-yl-L-cysteineS-2-propenyl-L-cysteineL-Cysteine, S-2-propen-1-yl3-(ALLYLTHIO)-L-ALANINES-(2-PROPENYL)-L-CYSTEINEH-Cys(Allyl)-OHS-allyl-laevo-cystein(s)-allyl-l-cysteine

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:74077
ChEMBL:CHEMBL2048654
EPA DTXSID:DTXSID20894862
PubMed:22685624
PubMed:22668601
PubMed:22629086
PubMed:22541895
PubMed:22518192
PubMed:22509214
PubMed:22439110
PubMed:22416880
PubMed:22408367
PubMed:22405339
PubMed:22404600
PubMed:22389672

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

Inventory details for S-ALLYLCYSTEINE

INCI name

S-ALLYLCYSTEINE

Description

L-Cysteine, S-2-propen-1-yl-

Record provenance

Inventory reference: 95981
Imported identity: S-ALLYLCYSTEINE
Source update: 18/04/2018

European Commission CosIng source notes

Annex records for S-ALLYLCYSTEINE

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Key data

CAS

21593-77-1

—

Restriction

—

Function

BLEACHING: Bleaching or lightening the shade of hair and/or skin.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#25117 · S-ALLYLCYSTEINE

Ingredients with overlapping formulation functions

RHODOPSEUDOMONAS SPHAEROIDES FERMENT FILTRATEBLEACHING

RHODOPSEUDOMONAS/PABA FERMENTBLEACHING, SKIN CONDITIONING

RHUS VERNICIFLUA BARK EXTRACTANTIOXIDANT, ASTRINGENT, BLEACHING, SKIN PROTECTING

RUBUS ELLIPTICUS FRUIT EXTRACTBLEACHING

SACCHAROMYCES/CAMELLIA SINENSIS LEAF/GANODERMA LUCIDUM/PANAX GINSENG ROOT FERME…ANTIOXIDANT, ASTRINGENT, BLEACHING, SKIN PROTECTING

SACCHAROMYCES/LAVENDER FLOWER/LEAF/STEM EXTRACT FERMENT FILTRATEANTI-SEBUM, ANTIOXIDANT, BLEACHING, HAIR CONDITIONING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLL…

SACCHAROMYCES/VACCINIUM VITIS-IDAEA FRUIT FERMENT EXTRACTBLEACHING, SKIN CONDITIONING

SALIX BLINII LEAF EXTRACTANTIOXIDANT, BLEACHING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SKIN PROTECTING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox 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

How S-ALLYLCYSTEINE appears in the CosIng inventory

The CosIng inventory lists S-ALLYLCYSTEINE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

S-ALLYLCYSTEINE is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

S-ALLYLCYSTEINE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, S-ALLYLCYSTEINE carries the following function designation(s):

BLEACHING

CAS 21593-77-1 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for S-ALLYLCYSTEINE

This page reproduces the CosIng inventory entry for S-ALLYLCYSTEINE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research S-ALLYLCYSTEINE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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