D 1777 N,N-Diethyl-p-phenylenediamine sulphate salt, 99%+ Cas 6283-63-2 - used in the analysis of drugs like dapsone hydrochloride, sulfamethoxazole and sulfadiazine containing aromatic amino group. D 1777 N,N-Diethyl-p-phenylenediamine sulphate salt, 99%+ Cas 6283-63-2 - used for the spectrophotometric determination of drugs such as salbutamol sulphate, ritodrine hydrochloride and isoxsuprine hydrochloride containing phenolic group.