(8R,9S,13S,14S,17S)-3-hydroxy-7-(9-hydroxynonyl)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl acetate,(8R,9S,13S,14S,17S)-3-hydroxy-7-(9-hydroxynonyl)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl acetate,Fulvestrant Impurity