2-Naphthalenesulfonicacid,6-amino-5-[2-[3-[(ethylphenylamino)sulfonyl]phenyl]diazenyl]-4-hydroxy-,sodium salt (1:1), Sodium 6-amino-5-((3-((ethylphenylamino)sulphonyl)phenyl)azo)-4-hydroxynaphthalene-2-sulphonate, 2-Naphthalenesulfonicacid,6-amino-5-[[3-[(ethylphenylamino)sulfonyl]phenyl]azo]-4-hydroxy-,monosodium salt (9CI), EINECS 279-306-3,