5-bromo-2-[1-(carboxymethyl)-3-[5-[(dimethylamino)sulphonyl]-2-tolyl]triazen-2-yl]benzoic acid, sodium salt

5-Bromo-2-[1-(carboxymethyl)-3-[5-[(dimethylamino)sulfonyl]-2-methylphenyl]-2-triazenyl]benzoic acid/sodium,(1:x) salt