5-[5-[4-Chloro-6-(3-sulfophenylamino)-1,3,5-triazin-2-ylamino]-2-sulfophenylazo]-1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridinemethanesulfonic acid

2-[[1,6-Dihydro-1-ethyl-2-hydroxy-4-methyl-6-oxo-5-(sulfomethyl)pyridine-3-yl]azo]-4-[[4-chloro-6-(3-sulfophenylamino)-s-triazine-2-yl]amino]benzenesulfonic acid

5-[[5-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridine-3-methanesulphonic acid