116265-76-0 2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((6-sulfo-2-naphthalenyl)azo)-, compd. with 2,2'-iminobis(ethanol) (1:4) 2-Naphthalenesulfonic acid, 7,7'-ureylenebis(4-hydroxy-3-((6-sulfo-2-naphthyl)azo)-, tetra(bis(2-hydroxyethyl)ammonium)salt