(4R,5R)-(+)-5-ethyl-1-(4-hydroxy-3-methoxyphenethyl)-2-oxo-4-piperidineacetic acid ethyl ester

(2R,3R)-10-benzyloxy-2-ethoxycarbonylmethyl-3-ethyl-1,2,3,4,6,7-hexahydro-9-methoxybenzoquinolizinium chloride

4-Piperidineacetic acid,1-[2-(5,6-dimethoxy-1H-indol-3-yl)-2-oxoethyl]-5-ethyl-2-oxo-, ethylester, trans-(±)-

ethyl trans-1-<2-(3,4,5-trimethoxyphenyl)-2-hydroxyethyl>-5-ethyl-2-oxo-4-piperidineacetate

(2R,3R)-9-benzyloxy-2-ethoxycarbonylmethyl-3-ethyl-1,2,3,4,6,7-hexahydro-10-methoxybenzoquinolizinium chloride