101858-18-8 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) Entac-6