(2E,6E,8E)-(4S,5S)-10-((2R,5S,7R,8S)-2-Butyl-2-formyl-8-methyl-1,6-dioxa-spiro[4.5]dec-7-yl)-4,8-dimethyl-5-triisopropylsilanyloxy-deca-2,6,8-trienoic acid 2-trimethylsilanyl-ethyl ester

(E)-3-Methyl-4-oxo-but-2-enoic acid 2-trimethylsilanyl-ethyl ester

(2E,6E,8E)-(4S,5S)-10-[(2R,5S,7R,8S)-2-Butyl-2-((S)-1,2-dihydroxy-ethyl)-8-methyl-1,6-dioxa-spiro[4.5]dec-7-yl]-4,8-dimethyl-5-triisopropylsilanyloxy-deca-2,6,8-trienoic acid 2-trimethylsilanyl-ethyl ester