13-Ethyl-11-methylene-18,19-dinor-17alpha-pregn-4-en-20-yn-17-ol 18,19-Dinorpregn-4-en-20-yn-17-ol, 13-ethyl-11-methylene-, (17alpha)- 54024-22-5 DESOGESTREL Desogen Desogestrel [USAN:BAN:INN] Desogestrelum [INN-Latin] EINECS 258-929-4 HSDB 3593 ORG 2969