6-氯-3-羟基吡嗪-4-羧酸

3,6-二氯吡嗪-4-羧酸甲酯

3,6-二氯吡嗪-4-羧酸乙酯

3,6-二氯哒嗪-4-甲酰氯

tert-butyl N-(3,6-dichloropyridazin-4-yl)carbamate