CAS 76911-24-5 appears in our catalog under these names: (2S,5R)-Benzhydryl 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4-oxide, 98%, Tazobactam Acid Impurity 41, Tazobactam Impurity 6. Offered by: Combi-blocks, Chemat Brand. Available pack sizes: 1g, 25g, 5g, on request.