7-benzamido-4-hydroxynaphthalene-2-sulphonic acid 7-benzamido-4-hydroxynaphthalene-2-sulfonic acid 7-Benzamido-4-hydroxy-2-naphthalenesulfonic acid 4-Hydroxy-7-(benzoylamino)-2-naphthalenesulfonic acid 7-Benzoylamino-4-hydroxy-2-naphthalenesulfonic acid N-Benzoyl J acid 4-hydroxy-7-(phenylcarbonylamino)naphthalene-2-sulfonic acid 7-(benzoylamino)-4-hydroxy-naphthalene-2-sulfonic acid