. . "Aurintricarboxylic acid" . "3,3\u2032-[(3-Carboxy-4-oxocyclohexa-2,5-dien-1-ylidene)methylene]bis(6-hydroxybenzoic acid)" . . . . . . . . "5,5\u2032-[(3-Carboxy-4-oxocyclohexa-2,5-dien-1-ylidene)methylene]bis(2-hydroxybenzoic acid)" . . . . "aurintricarboxylic acid" . "Aluminon free acid" . "Aurintricarboxylic acid" . . . .