2-((E)-(4R,6S,8S)-4,11-Bis-benzyloxy-6,8-dihydroxy-undec-1-enyl)-6-methoxy-benzoic acid 1-ethoxy-vinyl ester

(1S,11S,13S,15R)-7,15-Bis-(tert-butyl-dimethyl-silanyloxy)-11-[3-(tert-butyl-dimethyl-silanyloxy)-propyl]-10,17-dioxa-tricyclo[11.3.1.03,8]heptadeca-3(8),4,6-trien-9-one