spiro[5,6-dihydroimidazo[5,1-c][1,4]oxazine-8,8'-6,7-dihydro-5H-naphthalene]-2'-carbonitrile
spiro[5,6-dihydroimidazo[5,1-c][1,4]oxazine-8,4'-tetralin]-6'-carbonitrile
6'-spiro[5,6-dihydroimidazo[5,1-c][1,4]oxazine-8,4'-tetralin]carbonitrile