2-Naphthalenesulfonic acid, 7-((((6-((4-ethoxy-3-sulfophenyl)azo)-5-hydroxy-7-sulfo-2-naphthalenyl)amino)carbonyl)amino)-4-hydroxy-3-((6-sulfo-2-naphthalenyl)azo)-, sodium salt, compd. with 2,2'-(methylimino)bis(ethanol) 83783-92-0 EINECS 280-827-3