<unk> Es are naturally occurring estrane steroids. They are in<unk> form, as the sodium salts of the C17β sulfate esters. The estrogens in<unk> Es, in their unconjugated active forms, include bioidentical human estrogens like estradiol and estrone as well as equine-specific estrogens such as equilin and 17β-dihydroequilin. The equine estrogens differ from human estrogens in that they have additional double bonds in the B ring of the steroid nucleus.<unk> Es contain both 17β-estrogens like estradiol and 17β-dihydroequilin and the C17α epimers like 17α-estradiol and 17α-dihydroequilin.
Conjugated estrogens
Phytoestrogen
Xenoestrogen
Antiestrogen
Esterified estrogens
Phytoprogestogen
Tissue-selective estrogen complex
Antiprogestogen