2-羟基-4H-吡啶并[1,2-a]嘧啶-4-酮

2H-吡啶并[1,2-a]嘧啶-2,4(3H)-二酮

2-氨基吡啶

ethyl 3-oxo-3-(pyridin-2-ylamino)propianoate

2-chloro-N-phenyl-4H-pyrido[1,2-a]pyrimidin-4-imine