Synonym: 4-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt, Acid Orange 7, Acid Orange A, Orange II, Tropaeolin 000 No. 2 CAS Number: 633-96-5 Empirical Formula (Hill Notation): C16H11N2NaO4S Molecular Weight: 350.32 Beilstein Registry Number:...