Appearance: White or yellowish crystalline powder, odorless, with slightly bitterness; Color becomes dark on meeting light. 

Usage: Sulfa drug, has inhibition action on hemolytic streptococcus, pneumococcus, meningitis, coccus and other bacteria, and its pharmacological action is similar to sulfadiazine. Its acetylate is easy soluble in water, and easy to be excreted from urea, almost impossible to cause kidney disturbance.