(8E,10E,12E)-(2R,5S,7S,14S,16R)-5-(tert-Butyl-dimethyl-silanyloxy)-7,18-dimethoxy-2,8,14,16-tetramethyl-17-oxo-octadeca-8,10,12-trienal

(6E,8E,10E)-(3R,5S,12S,14S,17R)-14-(tert-Butyl-dimethyl-silanyloxy)-1,12-dimethoxy-3,5,11,17-tetramethyl-18-triethylsilanyloxy-octadeca-6,8,10-trien-2-one