The molecule is a steroid phosphate oxoanion which is the dianion obtained by the deprotonation of the phosphate OH groups of betamethasone phosphate. It is a conjugate base of a betamethasone phosphate.
[2-[(8S,9R,10S,11S,13S,14S,16S,17R)-9-fluoro-11,17-dihydroxy-10,13,16-trimethyl-3-oxo-6,7,8,11,12,14,15,16-octahydrocyclopenta[a]phenanthren-17-yl]-2-oxoethyl] phosphate