Sulfanilamide

Sulfapyridine

Sulfasalazine

Sulfasalazine derivative for resolution 2-hydroxy-5-[[4-[[(6-methylpyridin-2-yl)amino]-sulfonyl]phenyl]azo]benzoic acid

Sulfathiazole

Sulfinpyrazone

Sulfinpyrazone for system suitability

Sulfinpyrazone impurity A - 1,2-diphenyl-4-(2-phenylsulphonylethyl)pyrazolidine-3,5-dione

Sulfinpyrazone impurity B - 1,2-diphenyl-4-(2-phenylthioethyl)pyrazolidine-3,5-dione

Sulindac