<unk> , or β-dihydroequilenin, also known as δ6,8-17β-estradiol or 6,8-didehydro-17β-estradiol, as well as estra-1,3,5(10),6,8-pentaen-3,17β-diol, is a naturally occurring steroidal estrogen found in horses which is closely related to equilin, equilenin, and estradiol, and, as the 3-sulfate ester sodium salt, is a minor constituent (0.5%) of conjugated estrogens (Premarin).<unk>  has unexpectedly shown a selective estrogen receptor modulator (SERM)-like profile of estrogenic activity in studies with monkeys, in which beneficial effects on bone and the cardiovascular system were noted but proliferative responses in breast and endometrium were not observed.
17β-Dihydroequilenin
17β-Dihydroequilin
17α-Dihydroequilenin
17α-Dihydroequilin
5α-Dihydroethisterone
3α-Androstanediol
8,9-Dehydroestradiol
3β-Androstanediol