Patent ID: 6939861

Claim:
A compound or pharmaceutically acceptable salt thereof having the formula wherein R 1 is C 1 -C 8 substituted or unsubstituted alkyl, C 2 -C 8 substituted or unsubstituted alkenyl, C 2 -C 8 substituted or unsubstituted alkynyl, C 4 -C 15 substituted or unsubstituted aryl, C 5 -C 20 substituted or unsubstituted arylalkyl, C 5 -C 20 substituted or unsubstituted biarylalkyl, C 5 -C 20 substituted or unsubstituted arylalkenyl, or C 5 -C 20 substituted or unsubstituted arylalkynyl; R 2 is H, C 1 -C 4 substituted or unsubstituted alkyl, C 2 -C 4 substituted or unsubstituted alkenyl, or C 2 -C 4 substituted or unsubstituted alkynyl; R 3 is H, C 1 -C 4 alkanoyl, or benzoyl; R 4 is H or OH; R 5 is H, OH, C 1 -C 4 alkoxy, C 2 -C 4 alkenyloxy, or C 2 -C 4 alkynyloxy; R 6 is OH or OMe; and m=0-2.