1-Chloropyrido[3,4-d]pyridazine
1,2,3,4-Tetrahydropyrido[2,3-d]pyridazin-8(7h)-one
1-(5-Bromofuro[3,2-b]pyridin-6-yl)ethanone
5-Chloro-8-fluoropyrido[3,4-b]pyrazine
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