(+/-)-1-(3,4-dimethoxy-2-hydroxyphenethyl)-5-ethyl-2-piperidone
1-(2-benzyloxy-3,4-dimethoxyphenethyl)-3-(1,1-ethylenedithioethyl)pyridinium bromide
1-(2-benzyloxy-3,4-dimethoxyphenacyl)-3-(1,1-ethylenedioxyethyl)pyridinium bromide
3-Benzenesulfinyl-1-[2-(2-benzyloxy-3,4-dimethoxy-phenyl)-ethyl]-5-ethyl-piperidin-2-one
1-(2-benzyloxy-3,4-dimethoxyphenethyl)-5-ethyl-3-phenylthio-2-piperidinone