(3-oxo-4H-1,4-benzoxazin-2-yl) acetate

(3-oxo-4H-1,4-benzoxazin-7-yl) acetate

7-甲氧基-2H-苯并[b][1,4]噁嗪-3(4H)-酮

6-甲氧基-4H-苯并[1,4]恶嗪-3-酮

7-羟基-2H-苯并[b][1,4]噁嗪-3(4H)-酮