tert-butyl 2-oxo-1H-pyridine-3-carboxylate

5-溴-2-羟基-烟酸 叔丁酯

2-methoxy-5-nitropyridine-3-carboxamide

1-butyl-2-oxopyridine-3-carboxylic acid

3-甲基-2-吡啶羰酰氯