5-[(3-carboxy-5-methyl-4-oxo-2,5-cyclohexadien-1-ylidene)(2,6-dichloro-4-sulphophenyl)methyl]-3-methylsalicylic acid, sodium salt

5-[(3-Carboxy-5-methyl-4-oxo-2,5-cyclohexadiene-1-ylidene)(2,6-dichloro-4-sulfophenyl)methyl]-2-hydroxy-3-methylbenzoic acid/sodium,(1:x) salt