The intermediate 2-amino-4-nitrophenol was diazotized and coupled with sodium 2,4-diaminobenzenesulfonate to form the high-strength leather brown RHM(C.I.Mordant brown 33).

• 制得的2-氨基-4-硝基苯酚经重氮化、与2；4-二氨基苯磺酸偶合；合成出高强度的皮革棕RHM(C.；I