| 摘要 |
Compounds having 1 to 2 substituents in the 3-position, represented by the following general formula: (FORMULA) (wherein R<u1>u represents an amino group which may be acylated or protected, and X represents a hydrogen atom or a methoxy group), show an excellent ss-lactamase-inhibiting action when used independently or in combination with other ss-lactam series antibiotics, thus being used as medicines for humans and for domestic animals. |
