5-(tert-butyl-dimethyl-silanyloxy)-6-{6-[4,6-dihydroxy-2-methoxy-8-(4-methoxy-benzyloxy)-10-methoxymethoxy-13-(4-methoxy-6-methyl-tetrahydro-pyran-2-yl)-3,7,9,11-tetramethyl-tridecyl]-5,6-dihydro-2H-pyran-2-yl}-2-methyl-hex-2-enoic acid methyl ester