1H-吡啶并[2,3-b][1,4]噁嗪-2(3h)-酮

3-羟基-2-苯基吡啶

2,3-二氢-1,4-二噁英并[2,3-B]嘧啶

2-氯-3-羟基-6-碘吡啶

8-Chloro-2,3-dihydro-[1,4]dioxino[2,3-b]pyridine