2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-(phenylazo)-, compd. with alpha,alpha',alpha''-(nitrilotri-2,1-ethanediyl)tris(omega-hydroxypoly(oxy-1,2-ethanediyl)) (1:2) 7,7'-(Carbonyldiimino)bis(4-hydroxy-3-(phenylazo)-2-naphthalenesulfonic acid) di(ethoxylated triethanolamine) salt 72987-48-5