A compound of the formula or of the formula (I') wherein R 2 is H, halogen or (C 1 -C 6)alkyl; R 3 is H, halogen, or (C 1 -C 6)alkyl; R 4 is H, halogen, or (C 1 -C 6)alkyl; R 5 is H, halogen, or (C 1 -C 6)alkyl; R 6 is H, (C 1 -C 6)alkyl, (C 3 -C 6)cycloalkyl or (C 1 -C 4)alkylene-(C 3 -C 6)cycloalkyl, R 6 ' is H, (C 1 -C 6)alkyl, (C 3 -C 8)cycloalkyl, (C 5 -C 10)heterocyclyl, (C 6 -C 10)aryl, (C 1 -C 4)alkylene-(C 3 -C 8)cycloalkyl, (C 1 -C 4)alkylene-(C 5 -C 10)heterocyclyl, (C 1 -C 4)alkylene-(C 6 -C 10)aryl, (C 1 -C 6)alkylene-O-(C 1 -C 6)alkyl, (C 1 -C 6)alkylene-C NH-(C 1 -C 6)alkyl, (C 1 -C 6)alkylene-C N[(C 1 -C 6)alkyl] 2, (C 1 -C 6)alkylene-C O-(C 1 -C 6)alkyl, C O-(C 1 -C 6)alkyl, C (C 1 -C 6)alkyl, C (C 3 -C 8)cycloalkyl, C NH-(C- 1 -C 6)alkyl, C N[(C 1 -C 6)alkyl] 2, C (C 1 -C 6)alkylene-(C 3 -C 8)cycloalkyl, C (C 1 -C 6)alkylene-(C 5 -C 10)heterocyclyl, C (C 1 -C 6)alkylene-(C 6 -C 10)aryl, or R 6 and R 6 ', together with the N-atom to which they are attached, form a (C 5 -C 10)heterocyclyl group; R 7 is H, halogen, (C 1 -C 6)alkyl, or O-(C 1 -C 6)alkyl; R 8 is H, halogen or (C 1 -C 4)alkyl; n is 1, 2, 3 or 4; m is 1, 3, 4 or 5; and L is O or O-(C 1 -C 6)alkylene; wherein in residue R 6 ' (C 6 -C 10)aryl and (C 5 -C 10)heterocyclyl are unsubstituted or substituted one or more times by suitable groups independently selected from CONH 2, CONH(C 1 -C 6)alkyl, CON[(C 1 -C 6)alkyl] 2 and wherein, if m is 3, R 6 is not H; and wherein, if m is 3 and R 6 is a residue selected from (C 1 -C 6)alkyl, (C 3 -C 6)cycloalkyl, or (C 1 -C 4)alkylene-(C 3 -C 6)cycloalkyl, alkyl, alkylene or cycloalkyl in said residue is substituted one or more times, by OH, OCH 3, COOH, COOCH 3, NH 2, NHCH 3, N(CH 3) 2, CONHCH 3 or CON(CH 3) 2; or their stereoisomeric forms and/or their pharmaceutically acceptable salts. R 2 is H, halogen or (C 1 -C 6)alkyl; R 3 is H, halogen, or (C 1 -C 6)alkyl; R 4 is H, halogen, or (C 1 -C 6)alkyl; R 5 is H, halogen, or (C 1 -C 6)alkyl; R 6 is H, (C 1 -C 6)alkyl, (C 3 -C 6)cycloalkyl or (C 1 -C 4)alkylene-(C 3 -C 6)cycloalkyl, R 6 ' is H, (C 1 -C 6)alkyl, (C 3 -C 8)cycloalkyl, (C 5 -C 10)heterocyclyl, (C 6 -C 10)aryl, (C 1 -C 4)alkylene-(C 3 -C 8)cycloalkyl, (C 1 -C 4)alkylene-(C 5 -C 10)heterocyclyl, (C 1 -C 4)alkylene-(C 6 -C 10)aryl, (C 1 -C 6)alkylene-O-(C 1 -C 6)alkyl, (C 1 -C 6)alkylene-C NH-(C 1 -C 6)alkyl, (C 1 -C 6)alkylene-C N[(C 1 -C 6)alkyl] 2, (C 1 -C 6)alkylene-C O-(C 1 -C 6)alkyl, C O-(C 1 -C 6)alkyl, C (C 1 -C 6)alkyl, C (C 3 -C 8)cycloalkyl, C NH-(C- 1 -C 6)alkyl, C N[(C 1 -C 6)alkyl] 2, C (C 1 -C 6)alkylene-(C 3 -C 8)cycloalkyl, C (C 1 -C 6)alkylene-(C 5 -C 10)heterocyclyl, C (C 1 -C 6)alkylene-(C 6 -C 10)aryl, or R 6 and R 6 ', together with the N-atom to which they are attached, form a (C 5 -C 10)heterocyclyl group; R 7 is H, halogen, (C 1 -C 6)alkyl, or O-(C 1 -C 6)alkyl; R 8 is H, halogen or (C 1 -C 4)alkyl; n is 1, 2, 3 or 4; m is 1, 3, 4 or 5; and L is O or O-(C 1 -C 6)alkylene; wherein in residue R 6 ' (C 6 -C 10)aryl and (C 5 -C 10)heterocyclyl are unsubstituted or substituted one or more times by suitable groups independently selected from CONH 2, CONH(C 1 -C 6)alkyl, CON[(C 1 -C 6)alkyl] 2 and wherein, if m is 3, R 6 is not H; and wherein, if m is 3 and R 6 is a residue selected from (C 1 -C 6)alkyl, (C 3 -C 6)cycloalkyl, or (C 1 -C 4)alkylene-(C 3 -C 6)cycloalkyl, alkyl, alkylene or cycloalkyl in said residue is substituted one or more times, by OH, OCH 3, COOH, COOCH 3, NH 2, NHCH 3, N(CH 3) 2, CONHCH 3 or CON(CH 3) 2;