苯并呋喃

二氧化氮

苯

2,2-dimethyl-3-(4-methylpyrid-3-yl)-4-oxo-4H-1,3-benzoxazine

3-(2,6-dimethylpyridin-3-yl)-2,2-dimethyl-2,3-dihydro-4H-benzo[e][1,3]oxazin-4-one