An object of the present invention is to provide a compound and a pharmaceutical composition which exhibit strong antibacterial activity against Gram-negative bacteria and drug-resistant Gram-negative bacteria. A compound represented by General Formula [1] (the reference signs in Formula have the same definitions as those described in the present specification) or a salt thereof has strong antibacterial activity against Gram-negative bacteria such as Pseudomonas aeruginosa and drug-resistant Gram-negative bacteria including multidrug-resistant Pseudomonas aeruginosa, and the pharmaceutical composition containing the compound or a salt thereof is useful as an antibacterial agent.
                            本发明的目的是提供一种对革兰氏阴性细菌和耐药革兰氏阴性细菌具有强抗菌活性的化合物和药物组合物。通式[1]代表的化合物(式中的参考符号与本说明书中描述的定义相同)或其盐对革兰氏阴性菌(如
铜绿假单胞菌)和耐药革兰氏阴性菌(包括耐多药
铜绿假单胞菌)具有很强的抗菌活性,含有该化合物或其盐的药物组合物可用作抗菌剂。