A compound represented by general formula (1) (wherein R
1
represents a hydrogen atom, an optionally substituted C
1-6
alkyl group or the like; R
2
represents a hydrogen atom, an optionally substituted C
1-6
alkyl group or the like; R
3
represents a hydrogen atom or an optionally substituted C
1-6
alkyl group; R
4
represents a hydrogen atom, an optionally substituted C
1-6
alkyl group or the like; X
1
represents an optionally substituted C
2-6
alkynylene group or the like; A represents an optionally substituted bivalent aromatic hydrocarbon group or the like; X
2
represents an optionally substituted C
1-6
alkylene group or the like; Y
1
represents an oxygen atom or the like; and R
5
represents a hydrogen atom or the like) or a salt thereof is useful as an antibacterial agent.
通用式(1)所代表的化合物(其中R1代表
氢原子、可选择地取代的C1-6烷基或类似物;R2代表
氢原子、可选择地取代的C1-6烷基或类似物;R3代表
氢原子或可选择地取代的C1-6烷基;R4代表
氢原子、可选择地取代的C1-6烷基或类似物;X1代表可选择地取代的C2-6炔基或类似物;A代表可选择地取代的二价
芳香烃基或类似物;X2代表可选择地取代的C1-6烷基或类似物;Y1代表
氧原子或类似物;R5代表
氢原子或类似物)或其盐可用作抗菌剂。