Synonyms: A-Norpregn-20-yne-2,17-diol,2-ethynyl-, 2-acetate 17-(methyl butanedioate), (2b,5a,17a)-; AF 141; Butanedioic acid,7-(acetyloxy)-1,7-diethynylhexadecahydro-8a,10a-dimethyldicyclopenta[a,f]naphthalen-1-ylmethyl ester, [1R-(1a,3ab,3ba,5ab,7a,8aa,8bb,10aa)]-