| 摘要 |
Compounds of the formula <IMAGE> (I) wherein R is hydrogen, alkyl of 1 to 4 carbon atoms, alkenyl of 2 to 4 carbon atoms, epoxide of 2 to 4 carbon atoms or alkyl of 1 to 4 carbon atoms substituted by 1 or 2 halogen atoms, hydroxyl, etherified or acylated hydroxyl of 1 to 7 carbon atoms, azido, phthaliamido, SR1, SOR1 or SO2R1 wherein R1 is aryl, are useful for their beta -lactamase inhibitory activity and their antibacterial activity.
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