4,4'-Methylenebis-(1-carboethoxy-3-anilino-5-oxo-3,4-dehydropiperidine)
4,4'-Methylenebis-(1-acetyl-3-anilino-5-oxo-3,4-dehydropiperidine)
1-p-Toluenesulphonyl-3-anilino-4-diethylaminomethyl-5-oxo-3,4-dehydropiperidine
1-Carboethoxy-3-anilino-4-diethylaminomethyl-5-oxo-3,4-dehydropiperidine
1-p-Toluenesulphonyl-3-anilino-5-oxo-3,4-dehydropiperidine