8H-furo[3',4':4,5]isoxazolo[2,3-a]pyrazine-8-acetic acid, octahydro-1,9-dioxo-, methyl ester InChI=1/C11H14N2O6/c1-17-7(14)4-12-2-3-13-9(10(12)15)8-6(19-13)5-18-11(8)16/h6,8-9H,2-5H2,1H methyl (1,9-dioxooctahydro-8H-furo[3',4':4,5]isoxazolo[2,3-a]pyrazin-8-yl)acetate