Synonyms: A-Norpregn-20-yne-2,17-diol,2-ethynyl-, 2-(hydrogen butanedioate), (2b,5a,17a)-; Dicyclopenta[a,f]naphthalene,A-norpregn-20-yne-2,17-diol deriv.; AF 57; Butanedioic acid,mono(2,6-diethynylhexadecahydro-6-hydroxy-3a,5a-dimethyldicyclopenta[a,f]naphthalen-2-yl)ester, [2R-(2a,3aa,3bb,5aa,6a,8ab,8ba,10ab)]-