methyl 2-{(2R,5S,6S)-6-[(2E,4Z,6S,8E,10S,11R,12R)-12-(tert-Butyldimethylsilyloxy)-11-methoxy-6,8,10-trimethyltrideca-2,4,8-trien-2-yl]-5-methyltetrahydro-2H-pyran-2-yl}acetate