(17R)-2α-Ethynyl-A-nor-5α-pregn-20-yne-2β,17-diol H-241 Af 45 (pharmaceutical) Af-45 A-Nor-5-alpha,17-alpha-pregn-20-yne-2-beta,17-diol, 2-ethynyl- A-Norpregn-20-yne-2,17-diol, 2-ethynyl-, (2-beta,5-alpha,17-alpha)- Dicyclopenta(A,F)naphthalene-1,7-diol, 1,7-diethynylhexadecahydro-8A,10A-dimethyl-, (1R-(1alpha,3abeta,3balpha,5abeta,7alpha,8aalpha,8bbeta,10aalpha))- Dicyclopenta(A,F)naphthalene-1,7-diol, 1,7-diethynylhexadecahydro-8A,10A-dimethyl-, (1R,3as,3br,5as,7R,8as,8bs,10as)-