Patent ID: 8748463

Claim:
A compound of Formula (IVa): and pharmaceutically acceptable salts thereof, wherein R 6a is adamantyl, or thiazolyl or oxazolyl, either of which may be unsubstituted or substituted with one or more -halo, aryl, —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 0; and n is an integer ranging from 2-10.