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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

Click for further information on drug naming conventions and International Nonproprietary Names.

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