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CAS 638-23-3

CAS 638-23-3 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 638-23-3
CAS 638-23-3PubChem CID 193653

Carbocysteine

S-carboxymethyl-L-cysteine is an L-cysteine thioether that is L-cysteine in which the hydrogen of the thiol group has been replaced by a carboxymethyl group. It has a role as a mucolytic. It is a L-cysteine thioether and a non-proteinogenic L-alpha-amino acid. It is a conjugate acid of a S-carboxylatomethyl-L-cysteine(1-). — ChEBI

IUPAC name
(2R)-2-amino-3-(carboxymethylsulfanyl)propanoic acid
Molecular formula
C5H9NO4S
Molecular weight
179.20 g/mol
Exact mass
179.02522894 Da
XLogP3
-3.1
Topological polar surface area
126.0 Ų
Hydrogen-bond donors
3
Hydrogen-bond acceptors
6
Covalent units
1
Defined stereocentres
1

Also known as

CarbocisteineS-Carboxymethyl-L-cysteineS-(CARBOXYMETHYL)-L-CYSTEINEcarbocisteinMucodyneRhinathiolTransbronchinLisomucil
16 more reported names
MuciclarMucolaseReomucilMucocisSiroxylMucolexCarbocisteinaCarbocitMucofanMucoprontl-carbocysteinePectoxL-Carbocisteine(R)-S-(Carboxymethyl)cysteineCarbocisteinumMethista
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External database identifiers

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

Records for CAS 638-23-3

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How CAS 638-23-3 is used on this site

CAS 638-23-3 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 638-23-3 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.