Fulvestrant Impurity E

Chemical Name: 7-[9-[(4,4,5,5,5-Pentafluoropentyl)sulfinyl]nonyl]estra-1,3,5(10),6-tetraene-3,17β-diol (as per EP); Estra-1,3,5(10),6-tetraene-3,17-diol,7-[9-[(4,4,5,5,5-pentafluoropentyl)sul finyl]nonyl]-(7α,17β) (as per USP)

Smile: C[C@@]12[C@@H](O)CC[C@@]1([H])[C@]3([H])C(CCCCCCCCCS(CCCC(F)(C(F)(F)F)F)=O)=CC4=C(C=CC(O)=C4)[C@@]3([H])CC2