(2R,3S)-4-{(2R,4S,5S,6S)-6-[(Z)-(2R,4R,9S)-9-(tert-Butyl-dimethyl-silanyloxymethyl)-2,4-dihydroxy-1,1,7-trimethyl-6-oxo-undec-7-enyl]-4,6-dimethoxy-5-triethylsilanyloxy-tetrahydro-pyran-2-yl}-3-methoxy-2-methoxymethoxy-butyric acid methyl ester

4-{4-[7-(tert-butyl-dimethyl-silanyloxymethyl)-2-methoxy-5-methyl-4-oxo-non-5-enyl]-10-methoxy-5,5-dimethyl-2-naphthalen-2-yl-11-triethylsilanyloxy-1,3,7-trioxa-spiro[5.5]undec-8-yl}-3-methoxy-2-methoxymethoxy-butyric acid methyl ester