17-Methylestradiol 17-alpha-Methyloestradiol-17-beta 302-76-1 EINECS 206-128-5 Estra-1,3,5(10)-triene-3,17-diol, 17-methyl-, (17beta)- (9CI) Estra-1,3,5(10)-triene-3,17beta-diol, 17-methyl- (8CI) Methylestradiol NSC 52245