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Substance Name: Pepsin
RN: 9001-75-6


  • Formed from pig pepsinogen by cleavage of one peptide bond. The enzyme is a single polypeptide chain and is inhibited by methyl 2-diaazoacetamidohexanoate. It cleaves peptides preferentially at the carbonyl linkages of phenylalanine or leucine and acts as the principal digestive enzyme of gastric juice.

Molecular Formula

  • Unspecified

Classification Codes

  • Gastrointestinal Agents
  • Mutation Data
  • TSCA Flag XU (Exempt from Reporting under Chemical Data Reporting Rule)
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Names and Synonyms

Results Name

  • Pepsin

Name of Substance

  • Pepsin
  • Saccharated pepsin [JAN]

MeSH Heading

  • Pepsin A


  • E.C. 3.4.1
  • E.C.
  • EINECS 232-629-3
  • Elixer lactate of pepsin
  • Lactated pepsin
  • Lactated pepsin elixir
  • Pepsin
  • Pepsin A
  • Pepsin fortior
  • Pepsin, bovine
  • Saccharated pepsin
  • UNII-GID333S43J

Systematic Names

  • A mixture of pepsin obtained from the gastric mucosa of hogs or cattle and lactose. It is an enzyme drug having a proteolytic activity
  • Pepsin A

Superlist Name

  • Pepsin

Registry Numbers

CAS Registry Number

  • 9001-75-6


  • GID333S43J

Other Registry Numbers

  • 8048-15-5
  • 9001-76-7

System Generated Number

  • 0009001756