4-(2,2-diphenylethenyl)-1,3,3-triphenylazetidin-2-one

1-tert-butyl-3,3-diphenyl-4-[(E)-2-phenylethenyl]azetidin-2-one

3-(2,2-diphenylacetyl)-4-hydroxy-6-methylpyran-2-one

3-methyl-6,6-diphenyl-1,3,5-triazabicyclo[3.2.0]heptane-2,4,7-trione

3-butyl-6,6-diphenyl-1,3,5-triazabicyclo[3.2.0]heptane-2,4,7-trione