Patent ID: 7585855

Claim:
A product of formula (I): wherein R1 is —(C1-C8)alkylaryl, or —(C1-C8)alkylheteroaryl, the aryl or heteroaryl portion of which is substituted with 0 to 5 substituents R8, which may be identical or different, chosen from H, halogen, alkyl, haloalkyl, O-haloalkyl, NH 2 , aryl and heteroaryl, where aryl of aryl and alkylaryl are, independently, monocyclic or polycyclic aromatic substituents containing from 6 to 14 carbon atoms, and where heteroaryl of heteroaryl and alkylheteroaryl are, independently, monocylic or polycyclic heteroaromatic substituents containing from 1 to 13 carbon atoms and from 1 to 4 heteroatoms selected from sulfur, oxygen, nitrogen and selenium; R2 is independently selected from the group consisting of H and OH; and R4, R5 and R6 are each independently selected from the group consisting of H and —(C1-C6)acyl.