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By certification 
PROBENECID
4 - ((dipropylamino) sulfonyl)-benzoicaci; 4 - (Dipropylsulfamoyl) benzoic acid; 4 - (dipropylsulfamoyl) benzoicacid; 4 - [(dipropylamino) sulfonyl]-benzoicaci; Apurina; benacen; Benemid; benemide; Benuryl; Benzoic acid, 4 - [(dipropylamino) sulfonyl] -; Benzoic acid, p-(dipropylsulfamoyl) -; benzoicacid, 4 - ((dipropylamino) sulfonyl); colbenemid; [1] col-probenecid; 4 - [(Dipropylamino) sulfonyl] benzoic acid ;; 4 - (dipropylsulfamoyl) benzoate
Formula: C13H19NO4S
Molecular Weight: 285.36
CAS :57-66-9
4 - ((dipropylamino) sulfonyl)-benzoicaci; 4 - (Dipropylsulfamoyl) benzoic acid; 4 - (dipropylsulfamoyl) benzoicacid; 4 - [(dipropylamino) sulfonyl]-benzoicaci; Apurina; benacen; Benemid; benemide; Benuryl; Benzoic acid, 4 - [(dipropylamino) sulfonyl] -; Benzoic acid, p-(dipropylsulfamoyl) -; benzoicacid, 4 - ((dipropylamino) sulfonyl); colbenemid; [1] col-probenecid; 4 - [(Dipropylamino) sulfonyl] benzoic acid ;; 4 - (dipropylsulfamoyl) benzoate
Formula: C13H19NO4S
Molecular Weight: 285.36
CAS :57-66-9