Synonyms: AC1L4OFP;17-Ethinyl-7alpha-methyl-19-nortestosterone;U 13851;U-13851;U 13,851;Pregn-4-en-20-yn-3-one, 17-hydroxy-7-methyl-, (7alpha,17alpha)-;(7R,8R,9S,10R,13S,14S)-17-ethynyl-17-hydroxy-7,10,13-trimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one