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
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.