Synonyms: 2,3-Cresoticacid, 5-[a-(3-carboxy-5-methyl-4-oxo-2,5-cyclohexadien-1-ylidene)-o-sulfobenzyl]-(8CI); Benzoic acid,3,3'-(3H-2,1-benzoxathiol-3-ylidene)bis[6-hydroxy-5-methyl-, S,S-dioxide;3H-2,1-Benzoxathiole, benzoic acid deriv.; Eriochrome Cyanine R free acid;Eriochrome Cyanine R monoanion; Eriochrome cyanine R free form; SolochromeCyanine R free acid