The molecule is a steroid phosphate oxoanion which is the dianion obtained by deprotonation of the phosphate OH groups of estramustine phosphate. It is a conjugate base of an estramustine phosphate.
[(8R,9S,13S,14S,17S)-3-[bis(2-chloroethyl)carbamoyloxy]-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl] phosphate