17alpha-Hexa-1',3'-diynylestra-1,3,5(10)-trien-17beta-ol 3-cyclopentyl ether 19,21,27-Trinorcholesta-1,3,5(10)-triene-20(22),23-diyn-17-ol, 3-(cyclopentyloxy)-, (17alpha)- 42380-76-7 Bdh 10,131 Bdh 10131