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CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Categories


Antineoplastic agent

Adjunct to antineoplastic therapy

Chemical Name

1,4,5,6-tetrahydro-4,6-dioxo-s-triazine-2-carboxylic acid (WHO)

Foreign Names

  • Oteracilum (Latin)
  • Oteracil (German)
  • Otéracil (French)
  • Oteracilo (Spanish)

Generic Names

  • Oteracil (OS: BAN)
  • Oxonic acid (IS)
  • UNII-5VT6420TIG (IS)
  • Oteracil Potassium (OS: JAN)
  • 5-Azaorotic acid, potassium salt (IS)
  • Allantoxanic acid, potassium salt (IS)
  • KOX (IS)
  • Oxonic acid, potassium salt (IS)
  • Potassium azaorotate (IS)
  • Potassium oxonate (IS)
  • UNII-4R7FFA00RX (IS)

Brand Names

  • Teysuno (Oteracil and Tegafur, + Gimeracil)
    Nordic Group, Austria; Nordic Pharma, Italy; Taiho, Spain
  • TS-One (Oteracil and Gimeracil, + Tegafur)
    Taiho, Hong Kong
  • TS-ONE (Oteracil and Tegafur, + Gimeracil)
    Taiho, Singapore
  • Ai Yi (Oteracil and Tegafur; Gimeracil)
    Hengrui, China
  • ESUEEW AN T (Oteracil and Tegafur, + Gimeracil)
    Sawai Seiyaku, Japan
  • NKS-1 T (Oteracil and Tegafur, + Gimeracil)
    Nippon Kayaku, Japan
  • S-1 (Oteracil and Tegafur; Gimeracil)
    Taiho, China
  • Teysuno (Oteracil and Tegafur, + Gimeracil)
    Nordic Drugs, Finland; Nordic Drugs, Norway; Nordic Drugs, Sweden; Nordic Pharma, Germany; Nordic Pharma, United Kingdom; Nordic Pharma, Hungary
  • TS-1 OD T (Oteracil and Tegafur, + Gimeracil)
    Toho Yakuhin, Japan
  • TS-1 T (Oteracil and Tegafur, + Gimeracil)
    Toho Yakuhin, Japan
  • TS-ONE (Oteracil and Tegafur, + Gimeracil)
    Taiho, Thailand


BANBritish Approved Name
ISInofficial Synonym
JANJapanese Accepted Name
OSOfficial Synonym
Rec.INNRecommended International Nonproprietary Name (World Health Organization)
WHOWorld Health Organization

Further information on drug naming conventions: International Nonproprietary Names.

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Further information

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