has role monohydroxybenzoic acid tricarboxylic acid fluorochrome quinomethanes histological dye aurintricarboxylic acid 3,3'-[(3-carboxy-4-oxocyclohexa-2,5-dien-1-ylidene)methylene]bis(6-hydroxybenzoic acid) 422.064 422.34120 5,5'-(3-Carboxy-4-oxocyclohexa-2,5-dienylidenemethylene)di(salicylic acid) A member of the class of quinomethanes that is 3-methylidene-6-oxocyclohexa-1,4-diene-1-carboxylic acid in which the methylidene hydrogens are replaced by 4-carboxy-3-hydroxyphenyl groups. The trisodium salt is the biological stain 'chrome violet CG' while the triammonium salt is 'aluminon'. Aluminon free acid C22H14O9 CAS:4431-00-9 CHEBI:87397 GIXWDMTZECRIJT-UHFFFAOYSA-N InChI=1S/C22H14O9/c23-16-4-1-10(7-13(16)20(26)27)19(11-2-5-17(24)14(8-11)21(28)29)12-3-6-18(25)15(9-12)22(30)31/h1-9,23-24H,(H,26,27)(H,28,29)(H,30,31) OC(=O)C1=CC(C=CC1=O)=C(c1ccc(O)c(c1)C(O)=O)c1ccc(O)c(c1)C(O)=O PMID:24430547 PMID:25170016 PMID:26015945 PMID:26077682 PMID:26079891 Reaxys:2228904 Wikipedia:Aurintricarboxylic_acid chebi_ontology chrome violet CG free acid