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N4-Acetylsulphadimethoxine SulfadiMethoxine N4-Acetate Sulfadimethoxine EP Impurity B 4-p-acetamidobenzenesulfonamido-2,6-dimethoxypyrimidine N-[4-(2,6-Dimethoxy-4-pyrimidinylsulfamoyl)phenyl]acetamide Sulfadimethoxine Impurity 2(Sulfadimethoxine EP Impurity B) N-[4-[(2,6-dimethoxypyrimidin-4-yl)sulfamoyl]phenyl]acetamide 4-Acetylamino-N-(2,6-dimethoxy-4-pyrimidinyl)benzenesulfonamide N-[4-(2,6-Dimethoxy-4-pyrimidinylaminosulfonyl)phenyl]acetamide 4-(Acetylamino)-N-(2,6-dimethoxy-4-pyrimidinyl)benzenesulfonamide N-(2,4-Dimethoxypyrimidine-6-yl)-4-(acetylamino)benzenesulfonamide Acetamide, N-[4-[[(2,6-dimethoxy-4-pyrimidinyl)amino]sulfonyl]phenyl]-