Patent ID: 7329687

Claim:
A compound having the structure: wherein: γ is an optional bond; R 1 , R 2 and R 3 are independently selected from the group consisting of hydroxyl, halo, sulfhydryl, alkoxy, aryloxy, and aralkyloxy, and further wherein either R 1 and R 2 or R 2 and R 3 can be linked to form a cyclic group; R 4 is selected from O, S, and NR x ; when γ is present, then R 5 is O, S or NR x ; when γ is absent, then R 5 is selected from the group consisting of OH, SH, acyloxy, and N(R x ) 2 wherein the R x may be the same or different and are as defined previously; R 6 , R 7 , R 8 and R 9 are independently selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, aralkyl, alkoxy, aryloxy, and aralkyloxy, providing that R 6 and R 7 , R 7 and R 8 , or R 8 and R 9 , are linked together to form a cyclic structure selected from five-membered rings, six-membered rings, and fused five-membered and/or six-membered rings, wherein the cyclic structure is aromatic, alicyclic, heteroaromatic, or heteroalicyclic, and has zero to 4 non-hydrogen substituents and zero to 3 heteroatoms; and R 10 and R 11 are independently selected from the group consisting of hydrogen, hydroxyl, alkyl, alkoxy, and halo, with the proviso that, when R 1 , R 2 , and R 3 are OCH 3 , R 7 , R 9 , R 10 , and R 11 are H, R 4 is O, and R 5 is OH, at least one of R 6 or R 8 is not OCH 3 .