6,6-Dimethyl-2,7-diphenyl-3a,6,8a,8b-tetrahydro-dipyrrolo[1,2-b;3',4'-d]isoxazole-1,3-dione
2-[5,5-Dimethyl-4-phenyl-1,5-dihydro-pyrrol-(2E)-ylidene]-3-oxo-succinic acid dimethyl ester
2,2-Dimethyl-3-phenyl-2H-pyrrole 1-oxide
1-hydroxy-5,5-dimethyl-4-phenylpyrrolidin-2-one
3-phenyl-4-methyl-4-nitrosopentanoic acid