Tazobactam Sodium Synonyms: TAZOBACTAM SODIUM SALT CAS: 89785-84-2 Assay: 99.0%~101.0%. Packing: 25Kg/cardboard drum MF: C20H19N4NaO5S MW: 450.44 Character: White to off-white powder. mp 140-147°C. solubility H2O: 50 mg/mL, clear, colorless Usage: beta-Lactamase inhibitor, used with beta-lactam antibiotics to enhance their effect. Preparation Products: Tazobactam acid.