| abstract |
A compound of the formula (I): wherein A is a hydrogen atom, an optionally substituted, unsaturated, N-containing heterocyclic group or a group of the formula (a) : wherein R is an optionally substituted aryl group or an optionally substituted heterocyclic group;M is -(CH2)n-, -(CH2)n-O-(CH2)m- or -(CH2)n-NH-(CH2)m-, wherein n and m are independently 0,1 or 2; Q is an optionally substituted cycloalkylene group, an optionally substituted arylene group or an optionally substituted divalent heterocyclic group; andthe moiety of the formula (b): is an optionally substituted, unsaturated, mono-, di-, tri- or tetra-cyclic, N-containing heterocyclic group which may contain additional hetero atom(s) selected from the group consisting of nitrogen, oxygen and sulfur atoms as the ring member(s), its prodrug or a pharmaceutically acceptable salt thereof. |