Oxadiazole derivative of Formula wherein R 1, R 2 denote H, Hal, CF 3, OCF 3, CN, NO 2, OH, A or OA, QS denotes -COOR 3, -CON(R 3)(CH 2) n CO 2 R 3, -CONR 3 (C 3 -C 6 cycloalkyl)CO 2 R 3, -CH 2 N(R 3)(CH 2) n CO 2 R 3, -CH 2 NR 3 (C 3 -C 6 cycloalkyl)CO 2 R 3, -CH 2 O(CH 2) n CO 2 R 3, -CH 2 O(C 3 -C 6 cycloalkyl)CO 2 R 3, -O(CH 2) n CO 2 R 3 or -O(C 3 -C 6 cycloalkyl)CO 2 R 3, W denotes CH or N, Z' denotes X 1, X 2 denote independently of one another F, Cl, -OCH 3, -CH 3, -C 2 H 5, -CF 3,-OCF 3, -O-isoPropyl, -O-isobutyl, -OCH 2 CN, -OCH 2 cyclopropyl,-CH 2 OH -CH 2 O-isoPropyl, -CH 2 O-isobutyl, -CH 2 OCH 2 cyclopropyl,-CH 2 NMe 2, -CH 2 OC 2 H 5, -NHCOMe, -NHCOEt, -NHSO 2 NMe 2,-NHSO 2 propyl, -CH 2 morpholine, -CH 2 pirolidine, -CH 2 NHMe, -SO 2 Me,-CH 2 SO 2 Me, -C≡C-CH 2 OMe, -(CH 2) 3 OMe, -O(CH 2) 2 OMe, -CO 2 H, -OH,-NO 2, -CN, -NHSO 2 CH 3, and/ or phenyl or pyridyl or piperidine, or morpholine R b is, A, Hal, OCF 3, (CH 2) n OH, (CH 2) n OA, CN, NO 2, N(R 3) 2, (CH 2) n SO 2 N(R 3) 2, SO 2 N(R 3) 2, (CH 2) n NR 3 SO 2 A, (CH 2) n SO 2 A, (CH 2) n N(SO 2 A) 2, NR 3 CON(R 3) 2 or NR 3 COA, NR 3 SO 2 N(R 3) 2; or if R 1 or R 2 is Hal, also CF 3, OR 3. A is branched or linear alkyl having 1 to 12 C-atoms, wherein one or more H-atoms may be replaced by Hal, OR 3, COOR 3, CN, N(R 3) 2 or Het and wherein one or more non-adjacent CH 2 -groups may be replaced by O, NR 3, CO or S and/or by -CH=CH- or -C=C-groups or cycloalkylene groups having 3 to 7 carbon atoms, or denotes cycloalkyl or cycloalkylalkylen having 3-7 ring C atoms Hal is F, Cl, Br or I, R 3 is H or A; 2 geminal groups R 3 together may form a ring with the atom they are attached to, and n is 0, 1, 2, 3, 4, 5, 6, 7 or 8, and pharmaceutically acceptable salts, tautomers, solvates and stereoisomers thereof, including mixtures thereof in all ratios. R 1, R 2 denote H, Hal, CF 3, OCF 3, CN, NO 2, OH, A or OA, QS denotes -COOR 3, -CON(R 3)(CH 2) n CO 2 R 3, -CONR 3 (C 3 -C 6 cycloalkyl)CO 2 R 3, -CH 2 N(R 3)(CH 2) n CO 2 R 3, -CH 2 NR 3 (C 3 -C 6 cycloalkyl)CO 2 R 3, -CH 2 O(CH 2) n CO 2 R 3, -CH 2 O(C 3 -C 6 cycloalkyl)CO 2 R 3, -O(CH 2) n CO 2 R 3 or -O(C 3 -C 6 cycloalkyl)CO 2 R 3, W denotes CH or N, Z' denotes X 1, X 2 denote independently of one another F, Cl, -OCH 3, -CH 3, -C 2 H 5, -CF 3,-OCF 3, -O-isoPropyl, -O-isobutyl, -OCH 2 CN, -OCH 2 cyclopropyl,-CH 2 OH -CH 2 O-isoPropyl, -CH 2 O-isobutyl, -CH 2 OCH 2 cyclopropyl,-CH 2 NMe 2, -CH 2 OC 2 H 5, -NHCOMe, -NHCOEt, -NHSO 2 NMe 2,-NHSO 2 propyl, -CH 2 morpholine, -CH 2 pirolidine, -CH 2 NHMe, -SO 2 Me,-CH 2 SO 2 Me, -C≡C-CH 2 OMe, -(CH 2) 3 OMe, -O(CH 2) 2 OMe, -CO 2 H, -OH,-NO 2, -CN, -NHSO 2 CH 3, and/ or phenyl or pyridyl or piperidine, or morpholine R b is, A, Hal, OCF 3, (CH 2) n OH, (CH 2) n OA, CN, NO 2, N(R 3) 2, (CH 2) n SO 2 N(R 3) 2, SO 2 N(R 3) 2, (CH 2) n NR 3 SO 2 A, (CH 2) n SO 2 A, (CH 2) n N(SO 2 A) 2, NR 3 CON(R 3) 2 or NR 3 COA, NR 3 SO 2 N(R 3) 2; or if R 1 or R 2 is Hal, also CF 3, OR 3. A is branched or linear alkyl having 1 to 12 C-atoms, wherein one or more H-atoms may be replaced by Hal, OR 3, COOR 3, CN, N(R 3) 2 or Het and wherein one or more non-adjacent CH 2 -groups may be replaced by O, NR 3, CO or S and/or by -CH=CH- or -C=C-groups or cycloalkylene groups having 3 to 7 carbon atoms, or denotes cycloalkyl or cycloalkylalkylen having 3-7 ring C atoms Hal is F, Cl, Br or I, R 3 is H or A; 2 geminal groups R 3 together may form a ring with the atom they are attached to, and n is 0, 1, 2, 3, 4, 5, 6, 7 or 8,