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CAS 616-91-1

CAS 616-91-1 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 616-91-1
CAS 616-91-1PubChem CID 12035

N-Acetyl-L-Cysteine

N-acetyl-L-cysteine is an N-acetyl-L-amino acid that is the N-acetylated derivative of the natural amino acid L-cysteine. It has a role as a ferroptosis inhibitor, a geroprotector, an antioxidant, an antiinfective agent, an antiviral drug, a radical scavenger, a vulnerary, an antidote to paracetamol poisoning, a mucolytic and a human metabolite. It is a N-acetyl-L-amino acid, an acetylcysteine and a L-cysteine derivative. It is a conjugate acid of a N-acetyl-L-cysteinate. — ChEBI

IUPAC name
(2R)-2-acetamido-3-sulfanylpropanoic acid
Molecular formula
C5H9NO3S
Molecular weight
163.20 g/mol
Exact mass
163.03031432 Da
XLogP3
0.4
Topological polar surface area
67.4 Ų
Hydrogen-bond donors
3
Hydrogen-bond acceptors
4
Covalent units
1
Defined stereocentres
1

Also known as

acetylcysteineN-Acetylcysteinemercapturic acidAcetadoteL-AcetylcysteineFluimucetinRespaireN-Acetyl cysteine
16 more reported names
AcetilcisteinaBrunacAcetylcysteinumSyntemucolTixairNeo-fluimucilL-Cysteine, N-acetyl-Mucolyticum-LappeN-Acetyl-3-mercaptoalanineCysteine, N-acetyl-, L-N-Acetyl-L-(+)-cysteineMucolyticumCetylevMercapturic acid, (R)-MUCOSIL-20Fluatox
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External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 616-91-1

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How CAS 616-91-1 is used on this site

CAS 616-91-1 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 616-91-1 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.