1,2-Cyclohexanedicarboxylic anhydride, 4-methyl- 1,3-Isobenzofurandione, hexahydro-5-methyl- 19438-60-9 4-Methyl-1,2-cyclohexanedicarboxylic anhydride 5-Methyl hexahydro-1,3-isobenzofurandione NSC128883