17beta-Dihydroequilin 3563-27-7 EINECS 222-633-3 ESTRA-1,3,5(10),7-TETRAENE-3,17BETA-DIOL Estra-1,3,5(10),7-tetraene-3,17-diol, (17beta)- NSC 12170 beta-Dihydroequilin