Patent ID: 8222451

Claim:
A compound having the formula: or a pharmaceutically acceptable salt thereof, wherein R 1 is —C 1 -C 6 alkyl, —C 3 -C 7 cycloalkyl, or adamantyl, any of which may be unsubstituted or substituted with one or more of the following groups: —C 1 -C 6 alkyl, —O—(C 1 -C 6 alkyl), —OH, —CN, —COOR′, —OC(O)R′, NHR′, N(R′) 2 , —NHC(O)R′ or —C(O)NHR′ groups wherein R′ is —H or unsubstituted —C 1 -C 6 alkyl; m is an integer ranging from 0-10; and n is 4, 5, 6, or 7.