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Ethyl L-Cysteine Hydrochloride



CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Category

Mucolytic agent

Chemical Names

(R)-2-Amino-3-sulfanylpropionsäureetylester hydrochlorid (IUPAC)

Etyl (2R)-2-amino-3-sulfanylpropanoate monohydrochloride (JP)

Etyl L-2-amino-3-mercaptopropionate hydrochloride

Foreign Names

  • L-Cysteinethylester hydrochlorid (German)
  • Etilcisteína, hidrocloruro de (Spanish)

Generic Names

  • Ethyl L-Cysteine Hydrochloride (OS: JAN)
  • Ethitanin (IS)
  • Eticysteinum hydrochloridum (IS)
  • Muscastine (IS)
  • Teincy (IS)
  • Ethyl L-Cysteine Hydrochloride (PH: JP XVII)

Brand Names

  • Cystanin
    Tanabe Mitsubishi Pharma, Japan
  • Ruo Jing [+ Glycyrrhizinate, + Glycine, + Glucose]
    Weigao Group, China


IUPACInternational Union of Pure and Applied Chemistry
ISInofficial Synonym
JANJapanese Accepted Name
JPThe Japanese Pharmacopoeia
OSOfficial Synonym
PHPharmacopoeia Name

Further information on drug naming conventions: International Nonproprietary Names.

Important Notice: The international database is in BETA release. This means it is still under development and may contain inaccuracies. It is not intended as a substitute for the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of any medication in any country is safe, appropriate or effective for you. Consult with your healthcare professional before taking any medication.

Further information

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