17-alpha-Butadiynyl-3,17-beta-dihydroxy-1,3,5(10)-estratriene 17-alpha-Butadiynylestra-1,3,5(10)-triene-3,17-beta-diol 2010-52-8 ESTRA-1,3,5(10)-TRIENE-3,17-beta-DIOL, 17-alpha-BUTADIYNYL-