Patent ID: 8227504

Claim:
A compound of formula (I): wherein R, R 1 , R 2 and R 3 are the same or different and independently of each other chosen from hydrogen, (C 1 -C 4 )alkyl or CF 3 ; R 4 is selected from the group consisting of phenyl, cyclohexyl, pyridinyl, furanyl, isoxazolyl, quinolinyl, naphthyridinyl, indolyl, benzoimidazolyl, benzofuranyl, chromanyl, 4-oxo-4H-chromenyl, 2,3-dihydro-benzofuranyl, benzo[1,3]dioxolyl and 2,5-dioxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepinyl; wherein said R 4 is optionally substituted one or more times with a substituent selected from halogen, hydroxy, (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy, CF 3 , hydroxymethyl, 2-hydroxyethylamino, methoxyethylamide, benzyloxymethyl, piperidinyl, N-acetyl-piperidinyl, pyrrolyl, imidazolyl and 5-oxo-4,5-dihydro-pyrazolyl; or a salt thereof or an enantiomer or a diastereomer thereof.