Patent ID: 7786139

Claim:
A compound having the following structure (IVg): or a pharmaceutically acceptable salt or stereoisomer thereof, wherein: a is 1, 2, 3 or 4; b is 1 or 2; x is 1, 2 or 3 with the proviso that when x is 1, R 1 is not a single methyl substituent; R 1 represents 1 or 2 substitutents independently halogen, C 1-6 alkyl, —CHF 2 or —CF 3 ; R 2 is at each occurrence the same or different and independently, hydrogen, C 1-6 alkyl, benzyl, —CH 2 CONH 2 , —CHF 2 , —CF 3 , or any two R 2 groups may be taken together to form a C 1-6 alkanediyl; R 3 , R 4 and R 5 are the same or different and independently hydrogen or C 1-6 alkyl; and R 7 and R 8 are the same or different and independently hydrogen, halogen, C 1-6 alkyl, —O(C 1-6 alkyl), C 1-6 haloalkyl or nitro.