4-chloropyrido[3,4-d]pyridazin-1(2H)-one

4-(2-hydroxyethylamino)pyrido(3,4-d)pyridazine-1(2H)-one

1,4-二氯吡啶并[4,3-d]哒嗪

4-((2-acetoxyethyl)amino)pyrido[3,4-d]pyridazin-1-yl acetate