Compounds of formula (I) wherein R 1 is alkyl, haloalkyl or cycloalkyl; R 2 is H, alkyl, haloalkyl or cycloalkyl; R 3 is H, alkyl or cycloalkyl; R 4 is substituted aryl, substituted arylalkyl, substituted heteroaryl or substituted heteroarylalkyl, wherein substituted aryl, substituted arylalkyl, substituted heteroaryl and substituted heteroarylalkyl are substituted by one to three substituents independently selected from H, halogen, alkyl, haloalkyl, cycloalkyl, cyano, hydroxy, alkoxy and haloalkoxy; R 5 is H, alkyl, haloalkyl or cycloalkyl; R 6 is H, alkyl or cycloalkyl; R 7 is substituted adamantanylalkyl , substituted cycloalkyl, substituted cycloalkylalkyl, substituted dicycloalkylalkyl, substituted heterocycloalkylarylalkyl, substituted aryloxycycloalkylalkyl, substituted aryl, substituted arylalkyl, substituted arylalkenyl, substituted diarylalkyl, substituted aryloxyalkyl, substituted diaryloxyalkyl, substituted arylaryloxyalkyl, substituted heteroaryl, substituted heteroarylalkyl, substituted heteroarylalkenyl, substituted arylheteroarylalkyl or substituted aryloxyheteroarylalkyl, wherein substituted adamantanylalkyl , substituted cycloalkyl, substituted cycloalkylalkyl, substituted dicycloalkylalkyl, substituted heterocycloalkylarylalkyl, substituted aryloxycycloalkylalkyl, substituted aryl, substituted arylalkyl, substituted arylalkenyl, substituted diarylalkyl, substituted aryloxyalkyl, substituted diaryloxyalkyl, substituted arylaryloxyalkyl, substituted heteroaryl, substituted heteroarylalkyl, substituted heteroarylalkenyl,substituted arylheteroarylalkyl and substituted aryloxyheteroarylalkyl are substituted by one to three substituents independently selected from H, halogen, alkyl, haloalkyl, cycloalkyl, cyano, hydroxy, alkoxy, haloalkoxy and phenyl; or pharmaceutically acceptable salts. R 1 is alkyl, haloalkyl or cycloalkyl; R 2 is H, alkyl, haloalkyl or cycloalkyl; R 3 is H, alkyl or cycloalkyl; R 4 is substituted aryl, substituted arylalkyl, substituted heteroaryl or substituted heteroarylalkyl, wherein substituted aryl, substituted arylalkyl, substituted heteroaryl and substituted heteroarylalkyl are substituted by one to three substituents independently selected from H, halogen, alkyl, haloalkyl, cycloalkyl, cyano, hydroxy, alkoxy and haloalkoxy; R 5 is H, alkyl, haloalkyl or cycloalkyl; R 6 is H, alkyl or cycloalkyl; R 7 is substituted adamantanylalkyl , substituted cycloalkyl, substituted cycloalkylalkyl, substituted dicycloalkylalkyl, substituted heterocycloalkylarylalkyl, substituted aryloxycycloalkylalkyl, substituted aryl, substituted arylalkyl, substituted arylalkenyl, substituted diarylalkyl, substituted aryloxyalkyl, substituted diaryloxyalkyl, substituted arylaryloxyalkyl, substituted heteroaryl, substituted heteroarylalkyl, substituted heteroarylalkenyl, substituted arylheteroarylalkyl or substituted aryloxyheteroarylalkyl, wherein substituted adamantanylalkyl , substituted cycloalkyl, substituted cycloalkylalkyl, substituted dicycloalkylalkyl, substituted heterocycloalkylarylalkyl, substituted aryloxycycloalkylalkyl, substituted aryl, substituted arylalkyl, substituted arylalkenyl, substituted diarylalkyl, substituted aryloxyalkyl, substituted diaryloxyalkyl, substituted arylaryloxyalkyl, substituted heteroaryl, substituted heteroarylalkyl, substituted heteroarylalkenyl,substituted arylheteroarylalkyl and substituted aryloxyheteroarylalkyl are substituted by one to three substituents independently selected from H, halogen, alkyl, haloalkyl, cycloalkyl, cyano, hydroxy, alkoxy, haloalkoxy and phenyl; or pharmaceutically acceptable salts. <EOS>