Sulfapyridine (Standard) is the analytical standard of Sulfapyridine. This product is intended for research and analytical applications. Sulfapyridine, a major metabolite of Sulfasalazine, is a sulfonamide antibiotic agent. Sulfapyridine inhibits recombinant P. carinii dihydropteroate synthetase (DHPS) with an IC₅₀ of 0.18 μM. Sulfapyridine has antibacterial, anti-inflammatory and anti-rheumatic activities^[1][2][3].