Compound of formula: wherein R 1 R 2 and R 3 are each chlorine; R 4 and R 5 are selected independently from one another from the group consisting of hydrogen,, C 1 -C 6 -hydroxyalkyl, C 3 -C 6 -carbocycle, C(=O)-OH, -C(=O)-O-C 1 -C 6 -alkyl, -C 1 -C 6 -alkyl-C 1 -C 6 -alkoxy, -C 1 -C 6 -alkyl-C 1 -C 6 -haloalkyl, -C 1 -C 6 -alkyl-C 3 -C 6 -carbocycle, -C 1 -C 6 -alkylaryl, -C 1 -C 6 -alkyl-hydroxyaryl, -C 1 -C 6 -alkyl-S-C 1 -C 6 -alkyl-, -C 1 -C 6 -alkyl-C(=O)-NH 2, -C 1 -C 6 -alkyl-C(=O)-OH, -C 1 -C 6 -alkyl-C(=O)-O-C 1 -C 6 -alkyl; or R 4 and R 5 form together with the carbon atom to which they are attached a C 3 -C 6 -carbocycle; W is oxygen; Y is NR 8 with R 8 being hydrogen; Z is selected from the group consisting of -C(=O)-OR a, wherein R a is selected from the group consisting of hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -cyanoalkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -alkynyl, C 3 -C 8 -cycloalkyl, aryl, aralkyl, 4-, 5- or 6-membered non-aromatic heterocyclyl, -C 1 -C 6 -alkyl-Si(C 1 -C 6 -alkyl) 3, -C 1 -C 6 -alkyl-C 3 -C 8 -cycloalkyl, 5- to 9-membered heteroaryl and -C 1 -C 6 -alkyl-5- to 9-membered heteroaryl, or R a can form together with R 4 and with the atoms to which they are attached, a 4- to 7-membered heterocycle; provided that compounds wherein R4 is selected from the group consisting of hydrogen, C1-C6-alkyl-aryl, C1-C6-alkyl-hydroxyaryl, cyclopropyl and R5 is hydrogen or R4 and R5 together with the carbon atom to which they are attached form a cyclopropyl are excluded from the compounds of formula; and salts, N-oxides and solvates of the compound of formula. R 1 R 2 and R 3 are each chlorine; R 4 and R 5 are selected independently from one another from the group consisting of hydrogen,, C 1 -C 6 -hydroxyalkyl, C 3 -C 6 -carbocycle, C(=O)-OH, -C(=O)-O-C 1 -C 6 -alkyl, -C 1 -C 6 -alkyl-C 1 -C 6 -alkoxy, -C 1 -C 6 -alkyl-C 1 -C 6 -haloalkyl, -C 1 -C 6 -alkyl-C 3 -C 6 -carbocycle, -C 1 -C 6 -alkylaryl, -C 1 -C 6 -alkyl-hydroxyaryl, -C 1 -C 6 -alkyl-S-C 1 -C 6 -alkyl-, -C 1 -C 6 -alkyl-C(=O)-NH 2, -C 1 -C 6 -alkyl-C(=O)-OH, -C 1 -C 6 -alkyl-C(=O)-O-C 1 -C 6 -alkyl; or R 4 and R 5 form together with the carbon atom to which they are attached a C 3 -C 6 -carbocycle; W is oxygen; Y is NR 8 with R 8 being hydrogen; Z is selected from the group consisting of -C(=O)-OR a, wherein R a is selected from the group consisting of hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -cyanoalkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -alkynyl, C 3 -C 8 -cycloalkyl, aryl, aralkyl, 4-, 5- or 6-membered non-aromatic heterocyclyl, -C 1 -C 6 -alkyl-Si(C 1 -C 6 -alkyl) 3, -C 1 -C 6 -alkyl-C 3 -C 8 -cycloalkyl, 5- to 9-membered heteroaryl and -C 1 -C 6 -alkyl-5- to 9-membered heteroaryl, or R a can form together with R 4 and with the atoms to which they are attached, a 4- to 7-membered heterocycle; provided that compounds wherein R4 is selected from the group consisting of hydrogen, C1-C6-alkyl-aryl, C1-C6-alkyl-hydroxyaryl, cyclopropyl and R5 is hydrogen or R4 and R5 together with the carbon atom to which they are attached form a cyclopropyl are excluded from the compounds of formula; and salts, N-oxides and solvates of the compound of formula.