Patent ID: 7592345

Claim:
A compound of formula IA or IB wherein R 1 is hydrogen or lower alkyl; R 2 is hydrogen, fluoro, hydroxy or lower alkyl; R 3 is hydrogen or lower alkyl; R 4 is —CHR 5 -A R 5 is hydrogen, lower alkyl, fluoro, CF 3 , CH 2 OH or cycloalkyl; A is aryl or heteroaryl, each of which is unsubstituted or substituted by (R 6 ) o ; R 6 is heteroaryl, lower alkyl, lower alkoxy, cyano, halogen, lower alkyl substituted by halogen, lower alkoxy substituted by halogen or NR 7 R 8 wherein when o is more than one, each R 6 is the same or different; o is 1, 2 or 3; R 7 , R 8 are each independently hydrogen or lower alkyl; R 9 is lower alkyl; R 10 is lower alkyl, lower alkoxy or halogen; n is 1 or 2; and m is 1 or 2; or a pharmaceutically acceptable acid addition salt thereof.