Dihydroergotamine EP Impurity A

Chemical Name: (6aR,9R)-N-[(2R,5S,10aS,10bS)-5-Benzyl-10b-hydroxy-2-methyl-3,6-dioxooctahydro-8H-oxazolo[3,2-a]pyrrolo[2,1-c]pyrazin-2-yl]-7-methyl-4,6,6a,7,8,9-hexahydroindolo[4,3-fg]quinoline-9-carboxamide (as per EP)

Synonym: Ergotamine

Smile: O=C([C@@](C=C12)([H])CN(C)[C@]2([H])CC3=CNC4=C3C1=CC=C4)N[C@@](O5)(C)C(N6[C@]5(O)[C@@](CCC7)([H])N7C([C@]6([H])CC8=CC=CC=C8)=O)=O