1,2,3,6-Tetrahydro-3-methylphthalic anhydride 1,3-Isobenzofurandione, 3a,4,7,7a-tetrahydro-4-methyl- 3-Methyl-.delta.(4)-tetrahydrophthalic anhydride 3-Methyl-.delta.-4-tetrahydrophthalic anhydride 3-Methyl-1,2,3,6-tetrahydrophthalic anhydride 3-Methyltetrahydrophthalic anhydride 4-Cyclohexene-1,2-dicarboxylic anhydride, 3-methyl- 5333-84-6 Maleic anhydride and 1,3-pentadiene adduct NSC2352