| 摘要 |
The invention relates to novel cephem compounds, of antimicrobial activity, of the formula: <IMAGE> wherein R1 is carboxy (C1-C6) alkyl or esterified carboxy (C1-C6) alkyl, R2 is carboxy or esterified carboxy, and R3 is (C1-C6) alkanoyloxy (C1-C6) alkyl, tetrazolopyridazinylthio (C1-C6) alkyl, tetrazolothio (C1-C6) alkyl, or (C1-C6) alkyl tetrazolothio (C1-C6) alkyl, and pharmaceutically acceptable salts thereof.
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