CAS number 638-23-3 YesY=, (R)
2387-59-9 (RS)
PubChem 193653
ChemSpider 168055 YesY
DrugBank DB04339
KEGG D06393 YesY
ChEBI CHEBI:16163 YesY
ATC code R05CB03
Jmol-3D images Image 1
Image 2
Molecular formula C5H9NO4S
Molar mass 179.19 g mol−1
Appearance Colorless solid
Melting point

204-207 °C

 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references
Carbocisteine molecule, in 3D

Carbocisteine is a mucolytic that reduces the viscosity of sputum and so can be used to help relieve the symptoms of chronic obstructive pulmonary disorder (COPD) and bronchiectasis by allowing the sufferer to bring up sputum more easily. Carbocisteine should not be used with antitussives (cough suppressants) or medicines that dry up bronchial secretions.

Carbocisteine is produced by alkylation of cysteine with chloroacetic acid.[1]


  1. ^ Karlheinz Drauz, Ian Grayson, Axel Kleemann, Hans-Peter Krimmer, Wolfgang Leuchtenberger, Christoph Weckbecker “Amino Acids” in Ullmann's Encyclopedia of Industrial Chemistry 2007, Wiley-VCH, Weinheim. doi:10.1002/14356007.a02_057.pub2

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