2-[[5-carbamoyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-1-[2-(4-sulphophenyl)ethyl]-3-pyridyl]azo]-5-[(3-phosphonophenyl)azo]benzenesulphonic acid

2-[[[5-(Aminocarbonyl)-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-1-[2-(4-sulfophenyl)ethyl]pyridin]-3-yl]azo]-5-[(3-phosphonophenyl)azo]benzenesulfonic acid