carbamic acid 3,9,13-tris-(tert-butyl-dimethyl-silanyloxy)-14-[4-(tert-butyl-dimethyl-silanyloxy)-3,5-dimethyl-6-oxo-tetrahydro-pyran-2-yl]-2,4,8,10-tetramethyl-1-(1-methyl-pent-2-enyl)-tetradeca-6,11-dienyl ester