4,20-Dioxa-3,21-disilatricosa-8,13-diene,11,15,17-tris[[(1,1-dimethylethyl)dimethylsilyl]oxy]-21,21-diethyl-5-[(1R)-1-[(2S,4S,5S)-2-(4-methoxyphenyl)-5-methyl-1,3-dioxan-4-yl]ethyl]-2,2,3,3,6,8,10,12,18-nonamethyl-,(5R,6S,8Z,10S,11S,12S,13Z,15S,17S,18R)-