<unk> , also known as 17α-estradiol and sold under the brand names Avicis, Avixis, Ell-Cranell Alpha, and Pantostin, is a weak estrogen and 5α-reductase inhibitor medication which is used topically in the treatment of pattern hair loss (androgenic alopecia or pattern baldness) in men and women. It is a stereoisomer of the endogenous steroid hormone and estrogen 17β-estradiol (or simply estradiol).
Alfatradiol
Estradiol acetate
Estradiol valerate
Estradiol furoate
Estradiol 
Estradiol
Estradiol diundecylate
Estradiol sulfate