(2S,6S,8S,11R)-11-(tert-Butyl-dimethyl-silanyloxy)-8-(tert-butyl-diphenyl-silanyloxymethyl)-2-[(R)-2-(4-methoxy-benzyloxy)-1-methyl-ethyl]-4-methyl-1,7-dioxa-spiro[5.5]undec-4-ene

(Z)-(2S,5R,10S,11R)-5-(tert-Butyl-dimethyl-silanyloxy)-1-(tert-butyl-diphenyl-silanyloxy)-12-(4-methoxy-benzyloxy)-8,11-dimethyl-2,10-bis-trimethylsilanyloxy-dodec-7-en-6-one