2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-4-hydroxy-3-(phenylazo)-, compd. with 2,2'-iminobis(ethanol) (1:2) 5-Acetamido-4-hydroxy-3-(phenylazo)-2,7-naphthalenedisulfonic acid,bis(diethanolamine)salt 75659-69-7