(2R,3R,4R,4aS,8aS)-3,4-Bis-benzyloxy-2-benzyloxymethyl-2,3,4,4a,6,8a-hexahydro-pyrano[3,2-b]pyridine-5-carboxylic acid tert-butyl ester

(2R,3R,4R,4aS,8aR)-3,4-Bis-benzyloxy-2-benzyloxymethyl-2,3,4,4a,6,8a-hexahydro-pyrano[3,2-b]pyridine-5-carboxylic acid tert-butyl ester

(2R,3R,4R,4aS,9aS)-3,4-Bis-benzyloxy-2-benzyloxymethyl-3,4,4a,6,9,9a-hexahydro-2H-1-oxa-5-aza-benzocycloheptene-5-carboxylic acid tert-butyl ester

Allyl-((2S,3S,4R,5R,6R)-4,5-bis-benzyloxy-6-benzyloxymethyl-2-vinyl-tetrahydro-pyran-3-yl)-carbamic acid tert-butyl ester

Allyl-((2R,3S,4R,5R,6R)-4,5-bis-benzyloxy-6-benzyloxymethyl-2-vinyl-tetrahydro-pyran-3-yl)-carbamic acid tert-butyl ester