3-[(5-cyano-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridyl)azo]-4-hydroxy-N-[3-(1-methylethoxy)propyl]benzenesulphonamide

3-[[(5-Cyano-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridin)-3-yl]azo]-4-hydroxy-N-[3-(1-methylethoxy)propyl]benzenesulfonamide