13-chloro-2-(2-chlorophenyl)-3-oxa-6,9-diazatricyclo[8.4.0.0^{2,6}]tetradeca-1(10),11,13-trien-8-one
13-chloro-2-(2-chlorophenyl)-3-oxa-6,9-diazatricyclo[8.4.0.02,6]tetradeca-1(10),11,13-trien-8-one
13-chloro-2-(2-chlorophenyl)-3-oxa-6,9-diazatricyclo[8.4.0.02,6]tetradeca-1(14),10,12-trien-8-one