15792-41-3 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-((2-sulfophenyl)azo)-5-((2,5,6-trichloro-4-pyrimidinyl)amino)-, trisodium salt EINECS 239-892-3 Reactone red 2B Trisodium 4-hydroxy-3-((2-sulphonatophenyl)azo)-5-((2,5,6-trichloropyrimidin-4-yl)amino)naphthalene-2,7-disulphonate