| abstract |
The present invention provides a novel compound having a wide antibacterial spectrum, and expressing strong antibacterial activity against beta-lactamase-producing gram-negative bacteria in particular. This invention provides the compound represented by formula (I) (the meanings of the symbols are defined in the specification), or a protected product in which an amino group when the amino group exists on the ring in the 7-position side chain is protected, a pharmaceutically acceptable salt of the compound or protected product, and a pharmaceutical composition containing the same. |