Disclosed is a compound represented by the general formula: [wherein R1 represents an aryl or heterocyclic group which may be substituted or the like; X1 represents a C2-C4 alkylene group or the like; X2, X3 and X5 independently represent NH, a bond or the like; X4 represents a lower alkylene group, a bond or the like; Y1 represents a bivalent alicyclic hydrocarbon residue which may be substituted or a bivalent alicyclic amine residue which may be substituted; and Z1, Z2, Z3, Z4, Z5 and Z6 independently represent a nitrogen atom, a group represented by the formula: CH, or the like, provided that at least one of Z3, Z4, Z5 and Z6 represents a nitrogen atom] or a salt thereof, which is useful as an antibacterial agent.