CAS 1196157-90-0 appears in our catalog under these names: Sulfamethoxazole 13C6 (phenyl 13C6), Sulfamethoxazole-13C6, >95% (HPLC), Sulfamethoxazole–13C6, SULFAMETHOXAZOL-13C6, Sulfamethoxazole-13C6, 99.91%. Offered by: Dr. Ehrenstorfer, TRC, GLPBio, Sigma-Aldrich, MedChemExpress. Available pack sizes: 10mg, 1mg, 5mg, 5 mg, 1 mg, 1x1ml, 1x10mg.