17alpha-Ethynylestra-1,3,5(10)-triene-3,16alpha,17beta-triol 3-cyclopentyl ether 19-Nor-17-pregna-1,3,5(10)-trien-20-yne-16,17-diol, 3-(cyclopentyloxy)-, (16alpha,17alpha)- 19-Norpregna-1,3,5(10)-trien-20-yne-16,17-diol, 3-(cyclopentyloxy)-, (16alpha,17alpha)- 3-(Cyclopentyloxy)-17alpha-ethinyl-1,3,5(10)-estratrien-16alpha,17beta-diol 3-(Cyclopentyloxy)-19-nor-17alpha-pregna-1,3,5(10)trien-20-in-16alpha,17-diol 3-(Cyclopentyloxy)-19-nor-17alpha-pregna-1,3,5(10)trien-20-yne-16alpha,17-diol 39791-20-3 LY 49825 Lilly 49825 NYLESTRIOL Nilestriolum [INN-Latin] Nylestriol [USAN:BAN]