Synonyms: tetrasodium 3,3'-[[6-[bis(2-hydroxyethyl)amino]-1,3,5-triazine-2,4-diyl]bis(imino-4,1-phenyleneazo)]bisnaphthalene-1,5-disulphonate;3,3'-[6-[Bis(2-hydroxyethyl)amino]-1,3,5-triazine-2,4-diyl]bis(imino-4,1-phenyleneazo)bis(1,5-naphthalenedisulfonic acid)tetrasodium salt