API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Sulfamethoxazole

EP Impurity D

4-aminobenzenesulphonic acid (sulphanilic acid) Sulfamethoxazole-EP-Impurity-D
Sulfamethoxazole

EP Impurity E

4-aminobenzenesulphonamide (sulphanilamide) Sulfamethoxazole-EP-Impurity-E