tert-butyl (6E)(3S,8S,9S,5R)-3,5-bis(tert-butyldimethylsilyloxy)-9-[(4-methoxyphenyl)methoxy]-8,10-dimethyl-undec-6-enoate

7-(9-{(1E)(3S,4S)-4-[(4-methoxyphenyl)methoxy]-3,5-dimethylhex-1-enyl}(7S,9R)-6,10-dioxospiro[4.5]dec-7-yl)-1-{9-[(1S)-1-methyl-2-(phenylmethoxy)ethyl](7S,9R)-6,10-dioxaspiro[4.5]dec-7-yl}(4S,6S)-4-hydroxy-6-(tert-butyldimethylsilyloxy)heptan-2-one