6-Chloro-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one
4-Methyl-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one
1-Methyl-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one
7-Chloro-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-one
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