2,4-二氯-3-硝基吡啶

ethyl 5-amino-4,6-dichloropyridine-3-carboxylate

4,6-二氯-5-硝基烟酸乙酯

Ethyl 4-chloro-5-nitro-6-oxo-1,6-dihydro-3-pyridinecarboxylate