Dihydroergotamine EP Impurity C

Chemical Name: (6aR,9S,10aR)-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]-9-hydroxy-7-methyl-4,6,6a,7,8,9,10,10aoctahydroindolo[4,3-fg]quinoline-9-carboxamide (as per EP)

Synonym: 8-Hydroxy-9,10-dihydroergotamine