(2R,3R,11bS)-(+)-9-benzyloxy-2-(6-benzyloxy-3,4-dihydro-7-methoxy-1-isoquinolyl)methyl-3-ethyl-1,3,4,6,7,11b-hexahydro-10-methoxy-2H-benzoquinolizine

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

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

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