Synonyms: 4-Cyclohexene-1,2-dicarboxylicanhydride (8CI);1,2,3,6-Tetrahydrophthalic acid anhydride;3a,4,7,7a-Tetrahydro-1,3-isobenzofurandione;Cyclohexene-4,5-dicarboxylic anhydride;HK 019;KBH 1098;Maleic anhydride-butadiene adduct;NSC 82642;Rikacid TH;Rikacid THPA;Tetrahydrophthalic acid anhydride;D4-Tetrahydrophthalic anhydride;