5-[(3-carboxy-4-hydroxy-5-tolyl)(3-carboxy-5-methyl-4-oxo-2,5-cyclohexadien-1-ylidene)methyl]-3-methyl-salicylic acid, sodium salt

5-[(3-Carboxy-4-hydroxy-5-methylphenyl)(3-carboxy-5-methyl-4-oxo-2,5-cyclohexadiene-1-ylidene)methyl]-2-hydroxy-3-methylbenzoic acid/sodium,(1:x) salt