NameBenzenesulfonic acid,5-chloro-4-ethyl-2-[2-(4-hydroxy-1-naphthalenyl)diazenyl]-, barium salt (2:1) CAS73612-30-3 SynonymsBenzenesulfonicacid, 5-chloro-4-ethyl-2-[(4-hydroxy-1-naphthalenyl)azo]-, barium salt (2:1)(9CI) Molecular FormulaC18H15 Cl N2 O4 S . 1/2 Ba