((2R,5S,10aS,10bS)-5-Benzyl-8,10b-bis(benzyloxy)-2-methyl-3,6-dioxooctahydro-2H-oxazolo[3,2-a]pyrrolo[2,1-c]pyrazin-2-yl)carbamic Acid Benzyl Ester is an intermediate in the synthesis of metabolites of dihydroergotamine (D449080), an 5-HT1A agonist in the brain.