1 0RN Sulbactam 1.000 2 X1E (2s,5r,6r)-6-amino-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 0.812 3 A1H57 Tazobactam (2s,3s,5r) 0.750 4 TAZ Tazobactam 0.750