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Used as dye intermediates, agricultural chemicals, reagents. It is used in dyestuffs to produce permanent violet RL, Qingguang Haichang blue, etc. Sulfonamide antibacterial drugs for hemolytic streptococcus, pneumococcus and meningococcal infections. People who are allergic to sulfa drugs should not use it, and people with impaired renal function should use it with caution.