1,3-Naphthalenedisulfonic acid, 6,6'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)azo))bis(4-amino-5-hydroxy- 6,6'-(Vinylenebis((3-sulpho-4,1-phenylene)azo))bis(4-amino-5-hydroxynaphthalene-1,3-disulphonic) acid 63957-60-8 EINECS 264-578-8