| 摘要 |
A beta -lactam of the formula: <IMAGE> wherein R1 is aryl, substituted aryl, alkyl, alkenyl, or alkynyl; R2 is hydrogen, alkyl, acyl, acetal, ethoxyethyl, or other hydroxyl protecting group; and R3 is aryl, substituted aryl, alkyl, alkenyl, or alkynyl; and the enantiomers and diastereomers thereof.
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