2,2'-Stilbenedisulfonic acid, 4,4'-bis((4-amino-1-naphthyl)azo)- 4,4'-Bis((4-amino-1-naphthyl)azo)stilbene-2,2'-disulphonic acid 5463-64-9 Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-((4-amino-1-naphthalenyl)azo)- EINECS 226-754-2 NSC 5067