Pyrido[2,3-b]pyrazin-2(1H)-one
Pyrido[2,3-b]pyrazin-6(5H)-one
Pyrido[2,3-b]pyrazin-3(4H)-one
1,4-Dihydro-2-methyl-pyrido[2,3-b]pyrazin-3(2H)-one
2,3-Dimethylpyrido[3,4-b]pyrazin-5(6H)-one
