(2E,4E)-(S)-8-(tert-Butyl-dimethyl-silanyloxy)-6-(tert-butyl-dimethyl-silanyloxymethyl)-4-methyl-octa-2,4-dienoic acid ethyl ester

(5R,6R)-5-[(2'E,4'E,6'S)-8'-(tert-butyldimethylsylanyloxy)-6'-(tert-butyldimethylsilanyloxymethyl)-4'-methyl-2',4'-octadienoyl]-6-[(1'S,3'R,5'E)-(1',3',5'-trimethyl-5'-heptenyl)]-5,6-dihydro-2-pyranone

(2E, 4E, 6S)-8-(tert-butyldimethylsilanyloxy)-6-(tert-butyldimethylsilanyloxymethyl)-4-methyl-2,4-octadienoic acid