2-(4-羟苯基)吡喃[2,3-B]吡啶-4-酮

tert-butyl 4-(3-ethoxycarbonylpyridin-2-yl)piperazine-1-carboxylate

ethyl 2-(4-chloroanilino)pyridine-3-carboxylate

ethyl 2-(4-fluoroanilino)pyridine-3-carboxylate

2-(4-chloroanilino)pyridine-3-carbohydrazide