2-Hydroxy-4′-[(2-pyridinylamino)sulfonyl]-5-[2-[4-[(2-pyridinylamino)sulfonyl]phenyl]diazenyl][1,1′-biphenyl]-3-carboxylic acid

2-Hydroxy-4′-[(2-pyridinylamino)sulfonyl]-5-[2-[4-[(2-pyridinylamino)sulfonyl]phenyl]diazenyl][1,1′-biphenyl]-3-carboxylic acid