Estramustine

Estramustine (INN, USAN, BAN) is an estrogen and cytostatic antineoplastic agent which was never marketed.[1][2] It is an estrogen ester – specifically, the C3 normustine ester of estradiol – and acts in part as a prodrug of estradiol in the body.[1][2] Estramustine phosphate, the C17β phosphate ester of estramustine and a prodrug of estramustine, estromustine, estradiol, and estrone, is marketed and used in the ... [wikipedia]