(+/-)-1-[2-(2-benzyloxy-3,4-dimethyloxyphenyl)-2-hydroxyethyl]-5-ethyl-2-piperidone

5-acetyl-1-[2-(2-hydroxy-3,4-dimethoxyphenyl)ethyl]piperidin-2-one

1-(2-benzyloxy-3,4-dimethoxyphenethyl)-5-(1,1-ethylenedithioethyl)-2(1H)-pyridinone

1-(2-benzyloxy-3,4-dimethoxyphenethyl)-5-(1,1-ethylenedioxyethyl)-2(1H)-pyridinone

1-(2-(2-benzyloxy-3,4-dimethoxyphenyl)-2-hydroxyethyl)-3-piperidyl methyl ketone