7-methylthieno<2,3-b>pyridin-4(7H)-one

methyl 4-chloro-3-hydroxydithieno<2,3-b:2',3'-d>pyridine-2-carboxylate

4-methoxythieno<2,3-b>pyridine

ethyl 4,6-dichlorothieno<2,3-b>pyridine-5-carboxylate