Patent ID: 7271153

Claim:
A nitrogen-containing heterocyclic derivative represented by the general formula: wherein P represents a hydrogen atom or a lower acyl group, a lower alkoxy-substituted (lower acyl) group, a lower alkoxycarbonyl-substituted (lower acyl) group, a lower alkoxycarbonyl group, or a lower alkoxy-substituted (lower alkoxycarbonyl) group; X 1 and X 3 independently represent N or CH; X 2 represents N or CR 2 ; X 4 represents N or CR 3 ; and with the proviso that one or two of X 1 , X 2 , X 3 and X 4 represent N; R 2 represents a hydrogen atom, a halogen atom, a lower alkyl group, a cyclic lower alkyl group, a lower alkoxy group, an amino group, a (lower acyl)amino group, a mono(lower alkyl)amino group or a di(lower alkyl)amino group; R 3 represents a hydrogen atom or a lower alkyl group; R 11 represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group, a lower alkylthio group, a lower alkoxy-substituted (lower alkyl) group, a lower alkoxy-substituted (lower alkoxy) group, a lower alkoxy(lower alkoxy)-substituted (lower alkyl) group, a cyclic lower alkyl group, a halo(lower alkyl) group or a group represented by the general formula: P 1 —O-A- wherein P 1 represents a hydrogen atom or a lower acyl group, a lower alkoxy-substituted (lower acyl) group, a lower alkoxycarbonyl-substituted (lower acyl) group, a lower alkoxycarbonyl group, or a lower alkoxy-substituted (lower alkoxycarbonyl) group; and A represents a lower alkylene group, a lower alkyleneoxy group or a lower alkylenethio group, or a pharmaceutically acceptable salt thereof.