6-氯-2-甲基吡嗪-3(2H)-酮

3,6-二氯哒嗪

6-Chloro-2-phenyl-3(2H)-pyridazinone

ethyl 2-(3-chloro-6-oxopyridazin-1-yl)acetate

(3-氯-6-氧代哒嗪-1(6H)-基)乙酸