(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-dienal

(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

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

{(2S,3R,6S,8R,9S)-3-Butyl-3-(tert-butyl-dimethyl-silanyloxy)-8-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-9-methyl-1,7-dioxa-spiro[5.5]undec-2-yl}-methanol

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