6-Isopropyl-8-methylbicyclo(2.2.2)oct-5-ene-2,3-dicarboxylic anhydride 73728-72-0 BICYCLO(2.2.2)OCT-5-ENE-2,3-DICARBOXYLIC ANHYDRIDE, 6-ISOPROPYL-8-METHYL- BRN 1622830