| abstract |
The present invention provides novel compounds having a broad antibacterial spectrum, especially showing strong antibacterial activity against β-lactamase-producing Gram-negative bacteria. Specifically, the present invention provides a compound represented by formula (I) (in the formula, the meaning of each symbol is as defined in the description), or a protected body of the amino group when there is an amino group on the ring of its 7-position side chain, or its Pharmaceutically acceptable salts, ethyl pharmaceutical compositions containing them. |