Patent ID: 8362305

Claim:
A compound of Formula III: or a pharmaceutically acceptable salt thereof, wherein: R 1 is H or C 1 -C 10 alkyl; and R 2 is 4-hydroxyphen-1-yl, 4-methoxyphen-1-yl, 2,4-dimethoxyphen-1-yl, 3,5-dimethoxyphen-1-yl, 2,4-dimethoxy-3-methylphen-1-yl, 2,4,6-trimethoxyphen-1-yl, furan-3-yl; tetrahydrofuran-3-yl, furan-2-yl, tetrahydrofuran-2-yl, 5-ethylfuran-2-yl or pyridin-3-yl.