| 摘要 |
Compound of formula I:wherein R1, R2, R3, R4 and n have any of the values defined in the specification, and their pharmaceutically acceptable salts, are useful for inhibiting beta-lactamase enzymes, for enhancing the activity of beta-lactam antibiotics, and for treating beta-lactam resistant bacterial infections in a mammal. The invention also provides pharmaceutical compositions, processes for preparing compounds of formula I, and novel intermediates useful for the synthesis of compounds of formula I.
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