(2E,4E)-6-[(2R,3S,6S,8S,9R)-9-Butyl-9-(tert-butyl-dimethyl-silanyloxy)-8-ethynyl-3-methyl-1,7-dioxa-spiro[5.5]undec-2-yl]-4-methyl-hexa-2,4-dienoic acid methyl ester

tert-Butyl-dimethyl-[2-((2R,3S)-3-methyl-6-methylene-tetrahydro-pyran-2-yl)-ethoxy]-silane

1-(benzyloxy)-3-methyleneheptan-2-one

[2-((2R,3S,6S)-8-Benzyloxymethyl-9-butyl-3-methyl-1,7-dioxa-spiro[5.5]undec-8-en-2-yl)-ethoxy]-tert-butyl-dimethyl-silane

(2S,3R,6S,8R,9S)-2-Benzyloxymethyl-3-butyl-8-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-9-methyl-1,7-dioxa-spiro[5.5]undecan-3-ol