ts nitrogen atom to the carbonyl carbon atom and wherein said heterocyclic residue is unsubstituted or mono-, di- or trisubstituted independently of one another by R7, X is a nitrogen atom, Q is 1) a covalent bond, 2) ???(C0-C4)-alkylene-CH(OH)???(C0-C4)-alkylene-, 3) ???(C0-C4)-alkylene-O???(C0-C4)-alkylene-, 4) ???(C0-C4)-alkylene-C(O)???(C0-C4)-alkylene-, 5) ???(C0-C4)-alkylene-C(O)???O???(C0-C