(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

(2S,3S,6R)-3-Benzyloxy-6-(2-hydroxy-ethyl)-2-methyl-piperidine-1-carboxylic acid methyl ester

(2S,3S,6R)-3-Benzyloxy-6-methoxycarbonylmethyl-2-methyl-piperidine-1-carboxylic acid methyl ester