Patent ID: 8466153

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof, or a stereoisomeric form thereof, wherein R is hydrogen or C 1-6 alkyl; R 1 is phenyl; phenyl substituted with 1, 2 or 3 substituents each independently selected from the group consisting of hydrogen, halo, cyano, C 1-4 alkyl, C 1-4 alkyloxy, perfluoroC 1-4 alkyl, and trifluoromethoxy; thienyl; thienyl substituted with 1 or 2 substituents selected from the group consisting of halo and C 1-4 alkyl; C 1-4 alkyl; C 1-4 alkyl substituted with hydroxyl, C 3-8 cycloalkyl or C 5-7 cycloalkenyl; C 3-8 cycloalkyl; or C 5-7 cycloalkenyl; R 2 is hydrogen or C 1-6 alkyl; R 3 and R 4 each independently are hydrogen, C 1-4 alkyl or halo.