4-[N-(4-methylphenyl)-C-phenylcarbonimidoyl]-5-phenylfuran-2,3-dione

4-benzoyl-5-phenyl-1-propan-2-ylpyrrole-2,3-dione

1,2,3,7a-Tetrahydro-1,3-diisopropyl-2-(isopropylimino)-4,7a-diphenylfuro(2,3-d)pyrimidin-5,6-dion

5-benzoyl-3-methyl-2,4-diphenyl-2H-1,3-oxazepine-6,7-dione

5-benzoyl-3-ethyl-2,4-diphenyl-2H-1,3-oxazepine-6,7-dione