(3S,8R,9S,10R,13S,14S,17R)-17-ethynyl-3-hydroxy-13-methyl-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl acetate;(3?,17?)-19-Norpregn-4-en-20-yne-3,17-diol 17-Acetate; 19-Nor-17?-pregn-4-en-20-yne-3?,17-diol 17-Acetate; 17?-Ethynyl-3?-hydroxy-4-estrene-17?-acetate; SC 12222;Norethynodiol 17-Monoacetate
