Estradiol IMpurity C (4-Methyl Estradiol)

(17β)-4-Methylestra-1,3,5(10)-triene-3,17-diol

(8R,9S,13S,14S,17S)-4,13-diMethyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthrene-3,17-diol