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CAS 868-59-7 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 8899506/07/2012

ETHYL CYSTEINATE HCL

L-Cysteine, ethyl ester, hydrochloride (1:1)

ETHYL CYSTEINATE HCL 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 868-59-7

CAS 868-59-7PubChem CID 2723617

Ethyl cysteinate hydrochloride

Ethyl L-cysteine hydrochloride is an alpha-amino acid ester. — ChEBI

IUPAC name: ethyl (2R)-2-amino-3-sulfanylpropanoate;hydrochloride

Molecular formula: C5H12ClNO2S
Molecular weight: 185.67 g/mol
Exact mass: 185.0277275 Da
Topological polar surface area: 53.3 Å²
Hydrogen-bond donors: 3
Hydrogen-bond acceptors: 4
Covalent units: 2
Defined stereocentres: 1

Also known as

Ethyl L-cysteinate hydrochlorideCysteine ethyl ester hydrochlorideMucastineTaicisconTeincyDaiace (TN)ethyl cysteine hydrochlorideL-Cysteine, ethyl ester, hydrochloride (1:1)

16 more reported names

Ethyl L-cysteine hydrochlorideL-Cysteine, ethyl ester, hydrochlorideAM467TB2I1EINECS 212-779-6NSC 117387NSC 519837Cysteine ethyl ester hydrochloride (VAN)DaiaceETHYL L-CYSTEINE HYDROCHLORIDE [JAN]CYSTEINE, ETHYL ESTER, HYDROCHLORIDE, L-NSC-117387Ethyl L-cysteine hydrochloride (JP17)L-CYSTEINE ETHYL ESTER, HYDROCHLORIDEL-CYSTEINE ETHYL ESTER, HYDROCHLORIDE [WHO-DD]ETHYL L-2-AMINO-3-MERCAPTOPROPIONATE HYDROCHLORIDERefChem:596169

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:31569
ChEMBL:CHEMBL2360297
EPA DTXSID:DTXSID4046527

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 ETHYL CYSTEINATE HCL

INCI name

ETHYL CYSTEINATE HCL

Description

L-Cysteine, ethyl ester, hydrochloride (1:1)

Record provenance

Inventory reference: 88995
Imported identity: ETHYL CYSTEINATE HCL
Source update: 06/07/2012

European Commission CosIng source notes

Annex records for ETHYL CYSTEINATE HCL

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Key data

CAS

868-59-7

212-779-6

Restriction

—

Function

SKIN PROTECTING: Helping to avoid harmful effects to the skin from external factors.

Official EU ingredient-name evidence

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

#10047 · ETHYL CYSTEINATE HCl

Ingredients with overlapping formulation functions

ERYTHROXYLUM CATUABA EXTRACTSKIN PROTECTING

ESCHERICHIA COLI/PTEROCLADIA TENUIS FERMENT FILTRATESKIN PROTECTING

ESCHSCHOLZIA CALIFORNICA LEAF CELL EXTRACTSKIN PROTECTING

ETHYL CARBAZIDO HYALURONATE SH-OLIGOPEPTIDE-1 SH-POLYPEPTIDE-94 DIPEPTIDE-35 SH…SKIN PROTECTING

ETHYL DECADIENOATESKIN CONDITIONING, SKIN PROTECTING

ETHYLARGININOATE ACETAMIDOMETHIONAMIDESKIN PROTECTING

ETHYLARGININOATE ACETAMIDOMETHIONAMIDE HCLSKIN PROTECTING

ETHYLHEXANAMIDE SERINOLSKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SKIN PROTECTING, SURFACTANT - CLEANSING, SURFACTA…

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 ETHYL CYSTEINATE HCL appears in the CosIng inventory

The CosIng inventory lists ETHYL CYSTEINATE HCL 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.

ETHYL CYSTEINATE HCL 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

ETHYL CYSTEINATE HCL 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, ETHYL CYSTEINATE HCL carries the following function designation(s):

SKIN PROTECTING

CAS 868-59-7 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 ETHYL CYSTEINATE HCL

This page reproduces the CosIng inventory entry for ETHYL CYSTEINATE HCL 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 ETHYL CYSTEINATE HCL 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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