tetrasodium 5-[[3-[(5-chloro-2,6-difluoropyrimidin-4-yl)amino]benzoyl]amino]-3-[(2,5-disulphonatophenyl)azo]-4-hydroxynaphthalene-2,7-disulphonate

5-[[3-[(5-Chloro-2,6-difluoro-4-pyrimidinyl)amino]benzoyl]amino]-3-[(2,5-disulfophenyl)azo]-4-hydroxy-2,7-naphthalenedisulfonic acid tetrasodium salt