Patent ID: 8318763

Claim:
A compound of Formula I wherein: R is hydrogen or acetyl, R 1 and R 2 are each independently selected from the group consisting of hydrogen, (C 1-4 )alkyl, benzyloxy, mono- or di-(C 1-3 )alkylamino(C 1-4 )alkyl, (C 1-3 )alkoxy-(C 1-4 )alkyl, hydroxy-methyl, hydroxy-(C 2-4 )-alkyl, and nitro; or R 1 and R 2 taken together with two consecutive carbon atoms of the pyridine ring form a benzene ring unsubstituted, or mono- or di-substituted by one or two methyl or ethyl groups; and R 3 is hydroxyalkyl(C 1-4 ).