The compound in accordance with claim 1, wherein P3 is selected from the group consisting of C2-C6 alkenyl, heterocyclyl, OR2, ???OC2-C4alkyl???C(O)OR2 and ???C(O)R2, wherein R2 is a member selected from the group consisting of hydrogen, substituted or unsubstituted C1-C4 alkyl, substituted or unsubstituted C3-C8 cycloalkyl, substituted or unsubstituted heterocyclyl; substituted or unsubstituted a