(3aS,5S,9S,10S,11S,11aS)-11-((R)-3-((benzyloxy)methoxy)hexa-1,5-dien-2-yl)-6,10,12,12-tetramethyl-9-((triethylsilyl)oxy)-5-((triisopropylsilyl)oxy)-4,5,9,10,11,11a-hexahydro-8H-3a,7-methanocyclodeca[d][1,3]dioxole-2,8-dione