Patent ID: 7629347

Claim:
A compound, a pharmaceutically acceptable salt, or stereoisomer of Formula I, or mixtures thereof: wherein R 1 and R 2 are independently selected from the group consisting of H; alkyl; alkenyl; alkynyl; halogen; aryl; heteroaryl containing N, O, or S; the aryl and heteroaryl may be further substituted with halogen, an alkyl, alkenyl, and alkynyl; NZ 1 Z 2 , wherein Z 1 and Z 2 are independently selected from the group consisting of H and alkyl; and (CO)Y wherein Y is selected from the group consisting of H, alkyl, alkenyl, alkynyl, aryl, heteroaryl containing N, O, or S; with the proviso that when R 1 is hydrogen, R 2 is a group other than hydrogen; and when R 1 is methyl, R 2 is a group other than methyl.