3,4-Hihydro-1,4-benzoxazepin-5(2H)-one

3,4-Dihydro-2H-benzo[f][1,4]oxazepin-5-one

3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one

2-oxa-5-azabicyclo[5.4.0]undeca-7,9,11-trien-6-one