Synonyms: Mordant Brown 33 (13250); Mordant Brown 33 (C.I.); sodium 2,4-diamino-5-(2-hydroxy-5-nitrophenylazo)benzenesulphonate;2,4-Diamino-5-(2-hydroxy-5-nitrophenylazo)benzenesulfonic acid sodium salt;Mordant Brown 33;C.I. Mordant Brown 33; Acid Mordant Brown RH;