Compounds of formula (I) wherein R 1 is alkyl, substituted cycloalkyl, haloalkyl, substituted heterocycloalkylalkyl, substituted arylalkyl or substituted heteroarylalkyl, wherein substituted cycloalkyl, substituted heterocycloalkylalkyl, substituted arylalkyl and substituted heteroarylalkyl are substituted by R 10 , R 11 and R 12 ; R 2 , R 3 R 4 , R 6 , R 7 and R 9 are independently selected from H, alkyl and cycloalkyl; R 5 is substituted aryl, substituted arylalkyl, substituted heteroaryl or substituted heteroarylalkyl, wherein substituted aryl, substituted arylalkyl, substituted heteroaryl and substituted heteroarylalkyl are substituted by R 13 , R 14 and R 15 ; R 8 is substituted adamantylalkyl , substituted cycloalkyl, substituted cycloalkylalkyl, substituted dicycloalkylalkyl, substituted aryl, substituted arylalkyl, substituted arylalkenyl, substituted diarylalkyl, substituted aryloxyalkyl, substituted diaryloxyalkyl, substituted arylaryloxyalkyl, substituted heteroarylaryloxyalkyl, substituted heteroaryl, substituted heteroarylalkyl, substituted heteroarylalkenyl, substituted arylheteroarylalkyl, substituted arylheteroaryloxyalkyl or substituted aryloxyheteroarylalkyl, wherein substituted adamantylalkyl , substituted cycloalkyl, substituted cycloalkylalkyl, substituted dicycloalkylalkyl, substituted aryl, substituted arylalkyl, substituted arylalkenyl, substituted diarylalkyl, substituted aryloxyalkyl, substituted diaryloxyalkyl, substituted arylaryloxyalkyl, substituted heteroarylaryloxyalkyl, substituted heteroaryl, substituted heteroarylalkyl, substituted heteroarylalkenyl, substituted arylheteroarylalkyl, substituted arylheteroaryloxyalkyl and substituted aryloxyheteroarylalkyl are substituted by R 16 , R 17 and R 18 ; R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 and R 18 are independently selected from H, halogen, alkyl, haloalkyl, cycloalkyl, cyano, hydroxyl, alkoxy, haloalkoxy and phenyl; or pharmaceutically acceptable salts. R 1 is alkyl, substituted cycloalkyl, haloalkyl, substituted heterocycloalkylalkyl, substituted arylalkyl or substituted heteroarylalkyl, wherein substituted cycloalkyl, substituted heterocycloalkylalkyl, substituted arylalkyl and substituted heteroarylalkyl are substituted by R 10 , R 11 and R 12 ; R 2 , R 3 R 4 , R 6 , R 7 and R 9 are independently selected from H, alkyl and cycloalkyl; R 5 is substituted aryl, substituted arylalkyl, substituted heteroaryl or substituted heteroarylalkyl, wherein substituted aryl, substituted arylalkyl, substituted heteroaryl and substituted heteroarylalkyl are substituted by R 13 , R 14 and R 15 ; R 8 is substituted adamantylalkyl , substituted cycloalkyl, substituted cycloalkylalkyl, substituted dicycloalkylalkyl, substituted aryl, substituted arylalkyl, substituted arylalkenyl, substituted diarylalkyl, substituted aryloxyalkyl, substituted diaryloxyalkyl, substituted arylaryloxyalkyl, substituted heteroarylaryloxyalkyl, substituted heteroaryl, substituted heteroarylalkyl, substituted heteroarylalkenyl, substituted arylheteroarylalkyl, substituted arylheteroaryloxyalkyl or substituted aryloxyheteroarylalkyl, wherein substituted adamantylalkyl , substituted cycloalkyl, substituted cycloalkylalkyl, substituted dicycloalkylalkyl, substituted aryl, substituted arylalkyl, substituted arylalkenyl, substituted diarylalkyl, substituted aryloxyalkyl, substituted diaryloxyalkyl, substituted arylaryloxyalkyl, substituted heteroarylaryloxyalkyl, substituted heteroaryl, substituted heteroarylalkyl, substituted heteroarylalkenyl, substituted arylheteroarylalkyl, substituted arylheteroaryloxyalkyl and substituted aryloxyheteroarylalkyl are substituted by R 16 , R 17 and R 18 ; R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 and R 18 are independently selected from H, halogen, alkyl, haloalkyl, cycloalkyl, cyano, hydroxyl, alkoxy, haloalkoxy and phenyl; <EOS>