1,2-Cyclohexanedicarboxylic acid anhydride 1,2-Cyclohexanedicarboxylic anhydride 1,3-Isobenzofurandione, hexahydro- 85-42-7 Araldite HT 907 HHPA Hexahydrophthalic acid anhydride Hexahydrophthalic anhydride Lekutherm Hardener H NSC8622 NT 907