The molecule is a steroid phosphate which is the 17-O-phospho derivative of estramustine. It is a steroid phosphate, a carbamate ester and an organochlorine compound. It derives from an estramustine. It is a conjugate acid of an estramustine phosphate(2-).
[(8R,9S,13S,14S,17S)-13-methyl-17-phosphonooxy-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-3-yl] N,N-bis(2-chloroethyl)carbamate