benzyl rel(3S,4R)-4-ethoxycarbonylmethyl-3-ethylpiperidine-1-carboxylate

ethyl rel(3S,4R)-1-benzoyl-3-(1,3-dioxolan-2-ylmethyl)piperidine-4-acetate

benzyl rel(3S,4R)-4-ethoxycarbonylmethyl-3-(2-hydroxyethyl)-piperidine-1-carboxylate

ethyl rel(3S,4R)-3-(1,3-dioxolan-2-ylmethyl)piperidine-4-acetate

((1S,2R,12bR)-1-Ethyl-1,2,3,4,6,7,12,12b-octahydro-indolo[2,3-a]quinolizin-2-yl)-acetic acid ethyl ester