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Sulfaquinoxaline-13c6

Sulfisoxazole-13c6 (sulfafurazole-13c6)

Sulfanitran-13c6

Sulfachloropyrazine-13c6

Sulfaphenazole-13c6

Sulfapyrazole-13c6

Nalidixic acid-d5

Difloxacin-d3 hydrochloride trihydrate

Enoxacin-d8 hydrate