EINECS 265-533-5, 2,7-Naphthalenedisulfonic acid,4,4'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(2,1-diazenediyl))bis(3-hydroxy-,sodium salt (1:4), 2,7-Naphthalenedisulfonic acid,4,4'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(3-hydroxy-,tetrasodium salt