(2S,5S,6R)-5-Azido-6-((2R,4S,5R)-5-methoxymethoxy-2-methyl-[1,3]dioxan-4-yl)-4-oxo-tetrahydro-pyran-2-carboxylic acid ethyl ester

(2S,4S,5R,6R)-5-Azido-4-hydroxy-6-((2R,4S,5R)-5-methoxymethoxy-2-methyl-[1,3]dioxan-4-yl)-tetrahydro-pyran-2-carboxylic acid ethyl ester

(2S,6R)-4-(tert-Butyl-dimethyl-silanyloxy)-6-((2R,4S,5R)-5-methoxymethoxy-2-methyl-[1,3]dioxan-4-yl)-3,6-dihydro-2H-pyran-2-carboxylic acid ethyl ester