Patent ID: 6844345

Claim:
A chiral compound of formula (I) wherein —R 1 , R 2 , R 3 and R 4 are independently selected from hydrogen, halogen, hydroxy, alkyl, cycloalkyl, arylalkyl, aryl, alkoxy, alkoxyalkyl, haloalkyl, haloalkoxy, aryloxy, alkylcarbonyl, arylcarbonyl, alkylthio, arylthio, alkylsulfoxyl, arylsulfoxyl, alkylsulfonyl, arylsulfonyl, amino, nitro, cyano, alkoxycarbonyl, aryloxycarbonyl, mono- and di-alkylaminocarbonyl, alkylcarbonylamino, and carboxy; with the proviso that at least one of the moieties R 1 , R 2 , R 3 and R 4 is not hydrogen; R 5 is hydrogen, alkyl or cycloalkyl; R 6 is alkyl or cycloalkyl; and R 7 is hydrogen, halogen, alkyl, cycloalkyl, hydroxyalkyl, carboxyalkyl, carbamoylalkyl, alkoxycarbonylalkyl, aryloxycarbonylalkyl, formyl, alkylcarbonyl, alkoxy or alkylthio; or a pharmaceutically acceptable salt, a hydrate, or a pharmaceutically acceptable ester thereof.