The molecule is a steroid sulfate oxoanion that is the conjugate base of 17alpha-ethynylestradiol 3-sulfate arising from deprotonation of the sulfate OH group; major species at pH 7.3. It is a conjugate base of a 17alpha-ethynylestradiol 3-sulfate.
[(8R,9S,13S,14S,17R)-17-ethynyl-17-hydroxy-13-methyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-3-yl] sulfate