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

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

benzyl 5-(1,3-dioxolan-2-ylmethyl)-4-hydroxypiperidine-1-carboxylate

ethyl 3-(2-ethylenedioxyethyl)-4-hydroxypiperidine-1-carboxylate

ethyl 5-((1,3-dioxolan-2-yl)methyl)-7-oxa-3-azabicyclo[4.1.0]heptane-3-carboxylate