4-{(2R,3R)-3-[(E)-(R)-1,5-Bis-(tert-butyl-dimethyl-silanyloxy)-4-methyl-pent-3-enyl]-2,3-dimethyl-4-triisopropylsilanyloxy-2,3-dihydro-benzofuran-7-yl}-4-hydroxy-2-methoxy-3-methyl-cyclobut-2-enone

(2R,3R)-3-[(R)-(E)-bis(tert-butyldimethylsilanyloxy)methylpent-3-enyl]-7-methoxy-2,3,8-trimethyl-4-triisopropylsilanyloxy-2,3-dihydronaphtho[1,2-b]furan-6,9-dione

(2R,3R)-3-[(R)-(E)-bis(tert-butyldimethylsilanyloxy)methylpent-3-enyl]-7-methoxy-2,3,8-trimethyl-4-triisopropylsilanyloxy-2,3-dihydronaphtho[1,2-b]furan-6,9-dione