2 hydroxy 5 4 2 pyridinylamino sulfonyl phenyl azo benzoic acid, 2 hydroxy 5 4 pyridin 2 ylsulfamoyl phenylazo benzoic acid, 4 pyridyl 2 amidosulfonyl 3 carboxy 4 hydroxyazobenzene
For the treatment of Crohn's disease and rheumatoid arthritis as a second-line agent.