Patent ID: 7901894

Claim:
A compound having the formula: wherein R 1 is H or OH, R 2 is OH, R 3 is OH or H, and R 4 is CH 2 , CH 2 CH 2 , CH(CH 3 ) (R-configuration), CH(CH 3 )(S-configuration), or a bond, R 5 is OCH 3 , H, or OH, R 6 is OCH 3 , F, H, or OH, and R 7 is OCH 3 , H, OH, CO 2 H, CO 2 CH 3 , CH 2 CO 2 H, or CH 2 CO 2 CH 3 , provided that one of R 5 , R 6 or R 7 is not hydrogen and the remaining R 5 , R 6 or R 7 are H.