1,9-Dioxacyclohexadecane-2,10-dione,16-[(1R)-2-[[(1,1-dimethylethyl)diphenylsilyl]oxy]-1-methylethyl]-6-[(1S)-2-[[(1,1-dimethylethyl)diphenylsilyl]oxy]-1-methylethyl]-5,13-dimethyl-4,12-bis(phenylmethoxy)-, (4R,5S,6R,12R,13S,16S)-