InChI=1/C11H16N2O5/c1-11(17)5-7-9(15)12(6-8(14)18-2)3-4-13(7)10(11)16/h7,17H,3-6H2,1-2H methyl (7-hydroxy-7-methyl-1,6-dioxohexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl)acetate pyrrolo[1,2-a]pyrazine-2(1H)-acetic acid, hexahydro-7-hydroxy-7-methyl-1,6-dioxo-, methyl ester