(2S,3R,4R,5R,6R)-5-hydroxy-6-hydroxymethyl-2-methoxy-4-(3-oxobutylcarbonyloxy)-3-phenylcarbonyloxytetrahydro-2H-pyran

(2S,3R,4R,5S,6S)-5-hydroxy-6-iodomethyl-2-methoxy-4-(3-oxobutylcarbonyloxy)-3-phenylcarbonyloxytetrahydro-2H-pyran

(2S,3R,4R,5S,6S)-5-tert-butyldimethylsilyloxy-6-iodomethyl-2-methoxy-4-(3-oxobutylcarbonyloxy)-3-phenylcarbonyloxytetrahydro-2H-pyran