Compounds of formula wherein R 1 is alkyl, haloalkyl, cycloalkyl, haloalkoxy, cycloalkoxy, hydroxyalkyl, heterocycloalkyl, substituted heterocycloalkyl, substituted amino or substituted aminocarbonyl, wherein substituted heterocycloalkyl is substituted with one to three substituents independently selected from oxo, halogen or alkyl, and wherein substituted amino and substituted aminocarbonyl are substituted on the nitrogen atom with one to two substituents independently selected from alkyl, hydroxyalkyl and alkoxyalkyl, with the proviso that R 1 is not methyl or ethyl; R 2 is hydrogen, halogen, alkyl, haloalkyl, alkoxy or substituted amino, wherein substituted amino is substituted on the nitrogen atom with one to two alkyl; R 3 is hydrogen, alkoxy or halogen; R 4 is hydrogen, halogen, alkyl, nitro or cyano; R 5 is hydrogen; R 6 is phenyl, substituted phenyl, pyridinyl or substituted pyridinyl, wherein substituted phenyl and substituted pyridinyl are substituted with one to three substituent independently selected from alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, cycloalkylalkoxy, cycloalkylalkoxyalkyl, cycloalkoxy, cycloalkoxyalkyl, alkylcycloalkylalkyl, halocycloalkyl, halocycloalkylalkyl, halogen, cyano, haloalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, haloalkoxy, hydroxyalkoxy, alkoxyalkoxy, alkoxyalkoxyalkyl, hydroxyhaloalkyl, amino and substituted amino, wherein substituted amino is substituted with one to two substituents independently selected from alkyl, cycloalkyl, haloalkyl, alkylcycloalkyl, cycloalkylalkyl, alkylcycloalkylalkyl, hydroxyalkyl and alkoxyalkyl; R 7 is -COOH, tetrazol-5-yl, 3H-[1,3,4]oxadiazol-2-on-5-yl or 3H-[1,3,4]oxadiazole-2-thion-5-yl; n is zero or 1; with the proviso that at least one of R 2, R 3, R 4 and R 5 is different from hydrogen and that 6-methoxy-4-phenyl-2-tufluoromethyl-quinoline-3-carboxylic acid and 4-(3,4-dimethoxy-phenyl)-2-hydroxymethyl-6,7-dimethoxy-quinoline-3-carboxylic acid are excluded; or pharmaceutically acceptable salts or esters. R 1 is alkyl, haloalkyl, cycloalkyl, haloalkoxy, cycloalkoxy, hydroxyalkyl, heterocycloalkyl, substituted heterocycloalkyl, substituted amino or substituted aminocarbonyl, wherein substituted heterocycloalkyl is substituted with one to three substituents independently selected from oxo, halogen or alkyl, and wherein substituted amino and substituted aminocarbonyl are substituted on the nitrogen atom with one to two substituents independently selected from alkyl, hydroxyalkyl and alkoxyalkyl, with the proviso that R 1 is not methyl or ethyl; R 2 is hydrogen, halogen, alkyl, haloalkyl, alkoxy or substituted amino, wherein substituted amino is substituted on the nitrogen atom with one to two alkyl; R 3 is hydrogen, alkoxy or halogen; R 4 is hydrogen, halogen, alkyl, nitro or cyano; R 5 is hydrogen; R 6 is phenyl, substituted phenyl, pyridinyl or substituted pyridinyl, wherein substituted phenyl and substituted pyridinyl are substituted with one to three substituent independently selected from alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, cycloalkylalkoxy, cycloalkylalkoxyalkyl, cycloalkoxy, cycloalkoxyalkyl, alkylcycloalkylalkyl, halocycloalkyl, halocycloalkylalkyl, halogen, cyano, haloalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, haloalkoxy, hydroxyalkoxy, alkoxyalkoxy, alkoxyalkoxyalkyl, hydroxyhaloalkyl, amino and substituted amino, wherein substituted amino is substituted with one to two substituents independently selected from alkyl, cycloalkyl, haloalkyl, alkylcycloalkyl, cycloalkylalkyl, alkylcycloalkylalkyl, hydroxyalkyl and alkoxyalkyl; R 7 is -COOH, tetrazol-5-yl, 3H-[1,3,4]oxadiazol-2-on-5-yl or 3H-[1,3,4]oxadiazole-2-thion-5-yl; n is zero or 1;