trisodium 2-[[6-[(5-chloro-2,6-difluoropyrimidin-4-yl)amino]-1-hydroxy-3-sulphonato-2-naphthyl]azo]toluene-3,5-disulphonate

4-[[6-[[(5-Chloro-2,6-difluoropyrimidin)-4-yl]amino]-1-hydroxy-3-sodiosulfo-2-naphtyl]azo]-5-methyl-1,3-benzenedisulfonic acid disodium salt