ethyl 5-piperidin-1-ylpentanoate

2-piperidin-1-ylethyl 4-methoxybenzoate

diethyl 2-(piperidin-1-ylmethylidene)propanedioate

ethyl 2-acetyl-5-oxo-3,5-diphenylpentanoate

4-hydroxy-2-oxo-4,6-diphenyl-cyclohexanecarboxylic acid ethyl ester