Patent ID: 8703723

Claim:
A compound of formula I: or a pharmaceutically acceptable ester, conjugate, hydrate, solvate or salt thereof, wherein: R is selected from the group consisting of R a is CH 3 ; R b is CH 3 , CH 2 OH, or CHO; R c is H, OH, or CH 3 COO; R d is H or OH; R e is H or absent when R f is H, OH or a C═C exists between the atoms joined to R e , R f and R g ; R f is H, OH, or absent when R e is H or a C═C exists between the atoms joined to R e , R f and R g ; R g is H or when a C═C exists between the atoms joined to R e , R f and R g , R g is no group; R h is H or OH; X is O; R′ is an alkyl or aryl group; and Sugar is selected from the group consisting of and their epimers and conformers.