1-Naphthalenesulfonic acid, 6-amino-5-[[2-sulfo-4-[[2- (sulfooxy)ethyl]sulfonyl]phenyl]azo]-, sodium salt

6-amino-5-[[2-sulpho-4-[[2-(sulphooxy)ethyl]sulphonyl]phenyl]azo]naphthalene-1-sulphonic acid, sodium salt

6-Amino-5-[[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-1-naphthalenesulfonic acid/sodium,(1:x) salt