tert-Butyl-((E)-(1R,4R)-1-{(R)-[2-((1R,3S)-4,4-dimethoxy-1,3-dimethyl-butyl)-[1,3]dithian-2-yl]-methoxy-methyl}-4-[1,3]dithian-2-yl-2-methyl-pent-2-enyloxy)-dimethyl-silane

(2S,4E,6E,8S,9S,11R,13S,15S,16S)-allyl 16-(tert-butyldimethylsilyloxy)-8-hydroxy-2-{(1R,2R)-2-[(4-methoxybenzyloxy)methyl]cyclopentyl}-9,11,13,15-tetramethyl-18-oxooxacyclooctadeca-4,6-diene-7-carboxylate