(1,3-dioxo-1,3,3a,4,7,7a-hexahydro-2H-4,7-methanoisoindol-2-yl)acetic acid 4,7-methano-2H-isoindole-2-acetic acid, 1,3,3a,4,7,7a-hexahydro-1,3-dioxo- InChI=1/C11H11NO4/c13-7(14)4-12-10(15)8-5-1-2-6(3-5)9(8)11(12)16/h1-2,5-6,8-9H,3-4H2,(H,13,14