Synonyms: Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-(2-(4-hydroxyphenyl)diazenyl)-, sodium salt, compd. with 2-aminoethanol (1:?:?);4,4'-Bis((p-hydroxyphenyl)azo)stilbene-2,2'-disulphonic acid, sodium salt, compound with 2-aminoethanol;Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-((4-hydroxyphenyl)azo)-, sodium salt, compd. with 2-aminoethanol;sodium 5-[2-(4-oxocyclohexa-2,5-dien-1-ylidene)hydrazino]-2-[(E)-2-{4-[2-(4-oxocyclohexa-2,5-dien-1-ylidene)hydrazino]-2-sulfophenyl}ethenyl]benzenesulfonate 2-aminoethanol (1:1)