N-BENZOYL H ACID;4-(benzoylamino)-5-hydroxy-7-naphthalenedisulfonicacid;4-(benzoylamino)-5-hydroxynaphthalene-2,7-disulphonic acid;4-formamido-5-hydroxynaphthalene-2,7-disulfonic acid;4-Benzamido-5-hydroxy-2,7-naphthalenedisulfonic acid;5-Hydroxy-4-(benzoylamino)-2,7-naphthalenedisulfonic acid