(3R,4S)-6-ethoxy-3-ethyl-2,3,4,5-tetrahydro-4-pyridineacetic acid ethyl ester

4-Piperidineacetic acid,1-[2-[3,4-dimethoxy-2-(phenylmethoxy)phenyl]-2-hydroxyethyl]-5-ethyl-2-oxo-, ethyl ester, [1(S*),4a,5b]-(±)-

(4S,5S)-1-(2-benzyloxy-3,4-dimethoxyphenacyl)-5-ethyl-2-oxo-4-piperidineacetic acid ethyl ester

(3S,4S)-(-)-6-ethoxy-3-ethyl-2,3,4,5-tetrahydro-4-pyridineacetic acid ethyl ester

1-(2-benzyloxy-3,4-dimethoxyphenethyl)-5-ethyl-3-phenylthio-2-piperidinone