酸性媒介棕33，英文名为mordant brown 33，CAS号为3618-62-0，分子式为C12H10N5NaO6S，是一种化工中间体，主要用于毛条、毛线和各种毛织物的染色，特别适用于地毯的染色。C.I. 13250; C.I. Mordant Brown 33 (VAN); C.I. Mordant Brown 33， monosodium salt (8CI); C.I. Mordant Brown 33; Mordant Brown 33 (C.I.); sodium 2，4-diamino-5-(2-hydroxy-5-nitrophenylazo)benzenesulphonate; Mordant Brown 33 (13250); Acid Mordant Brown RH; sodium 2，4-diamino-5-[(2E)-2-(3-nitro-6-oxocyclohexa-2，4-dien-1-ylidene)hydrazinyl]benzenesulfonate; sodium 2，4-diamino-5-[(E)-(2-hydroxy-5-nitroph