3a,4,7,7a-tetrahydro-4,7-methano-2-benzofuran-1,3-dione 4,7-methanoisobenzofuran-1,3-dione, 3a,4,7,7a-tetrahydro- 5-NORBORNENE,2,3-DICARBOXYLIC ACID,ANHYDRIDE 826-62-0 InChI=1/C9H8O3/c10-8-6-4-1-2-5(3-4)7(6)9(11)12-8/h1-2,4-7H,3H