Disclosed is a compound represented by the general formula: [wherein R<1> represents an aryl or heterocyclic group which may be substituted or the like; X<1> represents a C2-C4 alkylene group or the like; X<2>, X<3> and X<5> independently represent NH, a bond or the like; X<4> represents a lower alkylene group, a bond or the like; Y<1> represents a bivalent alicyclic hydrocarbon residue which may be substituted or a bivalent alicyclic amine residue which may be substituted; and Z<1>, Z<2>, Z<3>, Z<4>, Z<5> and Z<6> independently represent a nitrogen atom, a group represented by the formula: CH, or the like, provided that at least one of Z<3>, Z<4>, Z<5> and Z<6> represents a nitrogen atom] or a salt thereof, which is useful as an antibacterial agent.