N4-Acetylsulfamethoxazole-13C6 (Acetylsulfamethoxazole-13C6) is the 13C-labeled N4-Acetylsulfamethoxazole (HY-W013266). N4-Acetylsulfamethoxazole (Acetylsulfamethoxazole) is a metabolite of?Sulfamethoxazole (HY-B0322). Sulfamethoxazole is a sulfonamide bacteriostatic antibiotic, used for bacterial infections[1].