[PROBLEMS] To provide compounds which have potent antibacterial activity and are useful in prevention and treatment as excellent antibacterial agents. [MEANS FOR SOLVING PROBLEMS] Compounds represented by the general formula [1] or salts thereof, which have potent antibacterial activity and high safety and are therefore useful as excellent antibacterial agents: [1] wherein R<；SUP>；1<；/SUP>； is optionally substituted alkyl, alkoxy, acyloxy, or the like； R<；SUP>；2<；/SUP>；, R<；SUP>；3<；/SUP>；, R<；SUP>；4<；/SUP>； and R<；SUP>；5<；/SUP>； are each independently hydrogen, optionally substituted alkyl or alkenyl, or the like； Z<；SUP>；1<；/SUP>； and Z<；SUP>；2<；/SUP>； are each nitrogen, CH, or the like； X<；SUP>；1<；/SUP>； is oxygen, NH, CH<；SUB>；2<；/SUB>；, or the like； X<；SUP>；2<；/SUP>； is carbonyl, NH, a free valency, or the like； X<；SUP>；3<；/SUP>； is C<；SUB>；1-4<；/SUB>； alkylene or a free valency； and R<；SUP>；6<；/SUP>； is substituted cyclic amino or the like.
