(3S,4S,6S)-6-[tert-butyl(diphenyl)silyl]oxy-2-(hydroxymethyl)-5-methyl-4-phenylmethoxyoxan-3-ol;[(3R,4R,6S)-3,5-dibenzoyloxy-6-[tert-butyl(diphenyl)silyl]oxy-4-phenylmethoxyoxan-2-yl]methyl benzoate;methyl (3S,4R,6S)-6-[tert-butyl(diphenyl)silyl]oxy-3,5-dimethyl-4-phenylmethoxyoxane-2-carboxylate;methyl (3S,4S,6S)-6-[tert-butyl(diphenyl)silyl]oxy-3-hydroxy-5-methyl-4-phenylmethoxyoxane-2-carboxylate