Patent ID: 7582672

Claim:
A compound of general formula (I): wherein R 1 , R 3 and R 4 are hydrogen; R 2 is halo; R 5 and R 6 are hydrogen; R 7 is C 1 -C 6 alkyl; R 8 is a phenyl, naphthalenyl, thiazole, biphenyl, quinolinyl or quinoxalinyl group, any of which may be substituted with one or more halo, C 1 -C 6 alkyl, —O(C 1 -C 6 )alkyl, —SO 2 R 11 , or —OH groups; wherein R 11 is independently hydrogen or C 1 -C 6 alkyl; R 9 is hydrogen; or a pharmaceutically acceptable salt thereof.