has role monohydroxybenzoic acid arenesulfonic acid quinomethanes histological dye chromoxane cyanin R free acid 470.067 470.44900 5-[(3-carboxy-5-methyl-4-oxocyclohexa-2,5-dien-1-ylidene)(2-sulfophenyl)methyl]-2-hydroxy-3-methylbenzoic acid A member of the class of benzoic acids that is 2-hydroxy-3-methyl-5-[(2-sulfophenyl)methyl]benzoic acid in which both of the benzylic hydrogens are replaced by a 3-carboxy-5-methyl-4-oxocyclohexa-2,5-dien-1-ylidene group. The trisodium salt is the biological stain 'chromoxane cyanin R'. C23H18O9S CC1=C\C(C=C(C(O)=O)C1=O)=C(\c1cc(C)c(O)c(c1)C(O)=O)c1ccccc1S(O)(=O)=O CHEBI:87389 InChI=1S/C23H18O9S/c1-11-7-13(9-16(20(11)24)22(26)27)19(15-5-3-4-6-18(15)33(30,31)32)14-8-12(2)21(25)17(10-14)23(28)29/h3-10,24H,1-2H3,(H,26,27)(H,28,29)(H,30,31,32)/b19-14+ KXOWVZNVTQLQPD-XMHGGMMESA-N Reaxys:2230086 chebi_ontology