Patent ID: 7495114

Claim:
A compound represented by the following formula: wherein: R 2 and R 5 are the same or different and are H; or together with the oxygen atoms at the C-10 and C-7 positions, respectively, a heterocyclic or aryl ether, a heterocyclic or aryl ester, a heterocyclic or aryl carbamate, a linear, branched or cyclic alkyl ester having from 1 to 10 carbon atoms in the alkyl, a linear, branched or cyclic alkenyl ester having from 2 to 10 carbon atoms in the alkenyl, a linear, branched or cyclic alkyl ether having from 1 to 10 carbon atoms, a linear, branched or cyclic alkenyl ether having from 1 to 10 carbon atoms, a carbamate of the formula —OCOX, wherein X is a nitrogen-containing heterocyclic, or a carbamate of the formula —OCONR 10 R 11 , wherein R 10 and R 11 are the same or different and are H, linear, branched or cyclic alkyl having 1 to 10 carbon atoms, or simple or substituted aryl; R 3 and R 4 are the same or different and are alkyl or alkenyl having from 1 to 10 carbon atoms, cycloalkyl or cycloalkenyl having from 3 to 10 carbon atoms, heterocyclic, or substituted heterocyclic; R 4 together with the —CONH— group at the C-3′ position can also be a carbamate formed from any of alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl, heterocyclic, substituted aryl or substituted heterocyclic and an oxygen atom; and R 19 is —COR 20 wherein R 20 is selected from the group consisting of disubstituted aryls and trisubstituted aryls, wherein the substituent is an electron withdrawing group or an electron donating group.