2-Naphthalenesulfonic acid, 6-hydroxy-5-[[2-methyl-4-[(2-methylphenyl)azo]phenyl]azo]-, monosodium salt 2-Naphthalenesulfonic acid, 6-hydroxy-5-[[4-(o-tolylazo)-o-tolyl]azo]-, sodium salt 7357-71-3 NSC65557