[(2S,3S,5R)-4-azido-2-hydroxy-6,8-dioxabicyclo[3.2.1]octan-3-yl] acetate;methyl (3S,4R,6R)-6-[(3S,4R)-6-acetyloxy-2-(acetyloxymethyl)-5-azido-4-methyloxan-3-yl]oxy-3-acetyloxychloranuidyl-4-methyl-5-phenylmethoxyoxane-2-carboxylate;methyl (3S,4S,6R)-6-[(3S,4R)-6-acetyloxy-2-(acetyloxymethyl)-5-azido-4-methyloxan-3-yl]oxy-3-hydroxy-4-methyl-5-phenylmethoxyoxane-2-carboxylate;methyl (3S,4R,6R)-6-[[(2S,3S,5R)-3-acetyloxy-4-azido-6,8-dioxabicyclo[3.2.1]octan-2-yl]oxy]-3-acetyloxychloranuidyl-4-methyl-5-phenylmethoxyoxane-2-carboxylate;methyl (3S,4R,6R)-3-acetyloxychloranuidyl-6-bromo-4-methyl-5-phenylmethoxyoxane-2-carboxylate