(2R,3S)-1-benzyl-3-methoxymethoxy-6-oxopiperidine-2-carboxylic acid ethyl ester

(5S,6R)-1-Benzyl-5-methoxymethoxy-6-phenylsulfanylmethyl-piperidin-2-one

[(5S,6S)-1-Benzyl-5-benzyloxy-6-methyl-piperidin-(2E)-ylidene]-acetic acid methyl ester