Patent ID: 7214708

Claim:
A compound having a structure represented by formula A: and the pharmaceutically acceptable salts, esters, and solvates thereof wherein R A is wherein R F and R J are independently H or CH 3 ; R G is H; R H is H, OCH 3 , or OH, or R H combines with R G to form a bond; R B and R C are independently H or CH 3 ; R D and R E are each H or R D and R E combine to form a bond; and X A is H or CH 3 (OCH 2 CH 2 ) n OCH 2 O, where the subscript n is 0 or 1; subject to the proviso that at least one of the following conditions is satisfied: (a) R B is CH 3 ; (b) X A is CH 3 (OCH 2 CH 2 ) n OCH 2 O, where the subscript n is 0 or 1; or (c) R A is