Trisodium hydrogen 2-((4-chloro-6-((3-((1-(2,5-dichloro-4-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-4-sulphonatophenyl)amino)-1,3,5-triazin-2-yl)amino)-5-sulphonatobenzoate