| 摘要 |
Antimicrobial activity is exhibited by .beta.-lactams having the formula: <IMG> or a pharmaceutically acceptable salt thereof, wherein R1 is an acyl substituent, Y is oxygen or sulfur and R5 is hydroxyl, alkyl, substituted alkyl, phenyl, substituted phenyl, alkoxy, alkylthio, (substituted alkyl)oxy, (substituted alkyl)thio, phenyloxy, phenylthio, (substituted phenyl)oxy or (substituted phenyl)thio.
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