4-OXO-4,5,6,7-TETRAHYDROBENZOFURAZAN

6,7-Dihydro-2,1,3-benzoxadiazol-4(5H)-one

6,7-DIHYDRO-5H-BENZO[1,2,5]OXADIAZOL-4-ONE

4,5,6,7-TETRAHYDRO-2,1,3-BENZOXADIAZOL-4-ONE