Estetrol Impurity 4

Chemical Name: (8R,9S,13S,14S,15R,16R,17R)-3-((Tert-butyldimethylsilyl)oxy)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthrene-15,16,17-triol

Smile: O[C@@H]1[C@@]2([H])[C@]3([H])CCC4=CC(O[Si](C)(C(C)(C)C)C)=CC=C4[C@@]3([H])CC[C@]2(C)[C@@H](O)[C@@H]1O