SMILES: C[C@]12CCC(=O)C=C1CC[C@@H]3[C@@H]2CC[C@]4([C@H]3CC[C@]4(C#C)O)C
Description: The molecule is a 17beta-hydroxy steroid that is testosterone in which the 17beta hydrogen is replaced by an ethynyl group. Ethisterone was the first orally active progestin and is a metabolite of danazol. It has a role as a progestin and a drug metabolite. It is a 17beta-hydroxy steroid, a 3-oxo-Delta(4) steroid, a terminal acetylenic compound and a tertiary alcohol. It derives from a testosterone.