| 摘要 |
The invention relates to compounds, useful as intermediates in the preparation of products of antimicrobial activity, of the formula: (* CHEMICAL STRUCTURE *) wherein R3 is hydrogen, lower alkyl, hydroxy(lower)alkyl, protected hydroxy(lower)alkyl, amino(lower)alkyl, protected amino (lower) alkyl, carbamoyl)lower)alkyl, N,N-di(lower) alkylcarbamoyl(lower)alkyl or an amino protective group, and R4 is hydrogen, lower alkyl, carboxy, protected carboxy, amino, protected amino or carbamoyl, or a salt thereof.
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