| abstract |
[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. |