4-Oxo-3,4-dihydropyrido[3,2-d]pyrimidine-7-carbonitrile
7-Methoxypyrido[3,2-d]pyrimidin-4(3h)-one
5-Chloro-2-methoxypyrido[3,4-b]pyrazine
2,5-Dichloropyrido[3,4-b]pyrazine
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