Tadalafil EP Impurity A

Chemical Name: (6R,12aS)-6-(benzo[d][1,3]dioxol-5-yl)-2-methyl-2,3,6,7,12,12a-hexahydropyrazino[1',2':1,6]pyrido[3,4-b]indole-1,4-dione; cis-ent-Tadalafil; Tadalafil USP Impurity C;

Smile: O=C([C@]1([H])CC2=C([C@](C3=CC=C(OCO4)C4=C3)([H])N15)NC6=C2C=CC=C6)N(C)CC5=O