Desogestrel

**Definition:** A synthetic progestational hormone used often as the progestogenic component of combined oral contraceptive agents (ORAL CONTRACEPTIVES, COMBINED).

**Tree numbers:** - D04.210.500.668.651.693.175

**Synonyms:** - 13-Ethyl-11-methylene-18,19-dinor-17 alpha-pregn-4-en-20-yn-17-ol - 18,19-Dinorpregn-4-en-20-yn-17-ol, 13-ethyl-11-methylene-, (17alpha)-