1,2,4-Benzenetricarboxylic acid 1,2,4-Tricarboxybenzene 1,3,4-Benzenetricarboxylic acid 1,4,5-Benzenetricarboxylic acid 4-09-00-03746 (Beilstein Handbook Reference) 4-Carboxyphthalic acid 528-44-9 67801-57-4 BRN 2214815 EINECS 208-432-3 NSC 72986 TRIMELLITIC ACID