Ethyl (S)-2-((3S,5aS,8aS,9aS)-9a-hydroxy-3-methyl-1,4-dioxodecahydro-2H-cyclopenta[4,5]pyrrolo[1,2-a]pyrazin-2-yl)-4-phenylbutanoate
Ethyl (S)-2-((3S,5aS,8aS,9aS)-9a-hydroxy-3-methyl-1,4-dioxodecahydro-2H-cyclopenta[4,5]pyrrolo[1,2-a]pyrazin-2-yl)-4-phenylbutanoate