Desogestrel

13-Ethyl-11-Methylene-Gon-4-En-17-One(CAS: 54024-21-4)

13-ethyl-17-hydroxy-11-methylene-gon-4-en-3-one (CAS: 220332-82-1)

11-Alpha-Hydroxy-18-Methylestra-4-Ene-3,17-Dione(CAS:53067-82-6)