Patent ID: 7531543

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof; wherein: R 1 , R 2 and R 3 are, independently, H, OH, alkyl, alkoxy, alkanoyloxy, CF 3 , or halo; or any two of R 1 , R 2 and R 3 taken together are methylenedioxy; both R 4 , taken together with the carbon atom to which they are attached, form a cyclobutyl, cyclopentyl, cycloheptyl, or cyclooctyl ring; R 5 , R 6 , and R 7 are, independently, H or (C 1 -C 4 )alkyl, provided that at least one of R 5 , R 6 , and R 7 is other than H; m is 1 or 3; and n is 0, 1, 2, or 3.