tert-butyl (3R)-3-tert-butyldimethylsilyloxy-4-acetoxy-4-p-tolylsulfenyl-butanoate

tert-butyl (+)-(3S,5R,7S,10R,11R)-1-tert-butyldimethylsilyloxy-7-hydroxy-3,5:10,11-di(isopropylidenedioxy)-tridec-8-en-13-oate

(+)-(S)-t-butyl-3-(t-butyldimethylsilyloxy)-butyrate

tert-butyl (+)-(3R,4S)-4-formyl-3,4-isopropylidenedioxy-butanoate

tert-butyl (+)-(3R,4S)-3,4-dihydroxy-4-(2-thiazolyl)-butanoate