(2S,4S,6R,8R,10S)-10-(tert-butyldimethylsilanyloxy)-4-methoxy-8-triisopropylsilanyloxymethyl-1,7-dioxaspiro[5.5]undec-2-ylmethyl 2,2-dimethylpropionate

[(2R,4S,6R,8R)-8-benzyloxymethyl-4-hydroxy-10-oxo-1,7-dioxaspiro[5.5]undec-2-yl]acetic acid tert-butyl ester

(2S)-2-benzyloxy-4-methylpent-4-enyl-2,2-dimethylpropionate

(2S)-2-benzyloxy-4-oxo-pentyl 2,2-dimethylpropionate

[(2R,4R,6S)-6-((2RS,6R)-7-benzyloxy-2-hydroxy-4-oxo-6-triethylsilanyloxyheptyl)-2-(4-methoxyphenyl)-[1,3]dioxan-4-yl]acetic acid tert-butyl ester