imidazo [ 4,5-b ] pyridine-2-carboxylic acid 2 , its methyl ester 5 , amide 7 , hydrazide 12 , hydrazone 14 , nitrile 16 , thioamide 18 , and amidoxime 20 were synthesized .
C0002482
amide
C0039875
thioamide