Synonyms: Entac-6;17-alpha-Ethynyl-19-nortestosterone acetate cyclopentyl enol ether;19-Nor-17-alpha-pregn-4-en-20-yn-17-beta-ol, 3-(cyclopentyloxy)-, acetate (ester);3-(Cyclopentyloxy)-19-nor-17-alpha-pregn-4-en-20-yn-17-beta-ol acetate (ester);AC1MI6PU;LS-97416;[(3S,8R,9S,10R,13S,14S)-3-cyclopentyloxy-17-ethynyl-13-methyl-2,3,6,7,8,9,10,11,12,14,15,16-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl] acetate;101858-18-8