(3R,4S,5R,6R)-3,4,5-tris(phenylmethoxy)-6-(phenylmethoxymethyl)piperidin-2-one

(6R,7S,8R,8aR)-6,7,8-tris(benzyloxy)-6,7,8,8a-tetrahydroindolizin-5(3H)-one

(3R,4S,5R,6R)-1-Allyl-3,4,5-tris-benzyloxy-6-hydroxymethyl-piperidin-2-one

(2S,3R,4S,5R)-1-Allyl-3,4,5-tris-benzyloxy-6-oxo-piperidine-2-carbaldehyde

(E)-3-((2R,3R,4S,5R)-1-Allyl-3,4,5-tris-benzyloxy-6-oxo-piperidin-2-yl)-acrylic acid methyl ester