7-methylamino-1-naphthol-3-sulfonic acid, 2-N-methylamino-8-hydroxynaphthalene-6-sulfonic acid, 1-Naphthalenol,7-nitro, 1-hydroxy-7-N-methylaminonaphthalene-3-sulphonic acid, 7-Nitro-naphth-1-ol, 1-Hydroxy-7-nitronaphthalene, 7-methylamino-1-hydroxynaphthalene-3-sulphonic acid, 4-hydroxy-6-methylamino-2-naphthalenesulphonic acid, 4-hydroxy-6-methylaminonaphthalene-2-sulphonic acid, 1-Hydroxy-7-nitronaphthalin