N-Acetyl-L-cysteine

CAS Registry Number®

616-91-1

CAS Name

N-Acetyl-L-cysteine

Molecular Formula

C5H9NO3S

Molecular Mass

163.20

Cite this Page

N-Acetyl-L-cysteine.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/detail?cas_rn=616-91-1 (retrieved 2025-05-12) (CAS RN: 616-91-1).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Melting Point (1)

    109.5 °C

Source(s)

  • (1) Hazardous Substances Data Bank data were obtained from the National Library of Medicine (US)

Other Names and Identifiers

InChI

InChI=1S/C5H9NO3S/c1-3(7)6-4(2-10)5(8)9/h4,10H,2H2,1H3,(H,6,7)(H,8,9)/t4-/m0/s1

InChIKey

InChIKey=PWKSKIMOESPYIA-BYPYZUCNSA-N

SMILES

[C@@H](NC(C)=O)(C(O)=O)CS

Canonical SMILES

O=C(O)C(NC(=O)C)CS

Other Names for this Substance

  • L-Cysteine, N-acetyl-
  • Cysteine, N-acetyl-, L-
  • N-Acetyl-L-cysteine
  • N-Acetylcysteine
  • Acetylcysteine

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Deleted or Replaced CAS Registry Numbers

7696-05-1, 1261105-20-7

CAS INSIGHTSTM
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