(2R,3R)-3-[(R)-(E)-bis-(tert-butyldimethylsilanyloxy)-methylpent-3-enyl]-7-bromo-2,3-dimethyl-4-triisopropylsilanyloxy-2,3-dihydrobenzofuran

4-{(2R,3R)-3-[(1E,3E)-5-(tert-Butyl-dimethyl-silanyloxy)-4-methyl-penta-1,3-dienyl]-2,3-dimethyl-4-triisopropylsilanyloxy-2,3-dihydro-benzofuran-7-yl}-4-hydroxy-2,3-dimethyl-cyclobut-2-enone

4-{(2R,3R)-3-[(1E,3E)-5-(tert-Butyl-dimethyl-silanyloxy)-4-methyl-penta-1,3-dienyl]-2,3-dimethyl-4-triisopropylsilanyloxy-2,3-dihydro-benzofuran-7-yl}-4-hydroxy-2,3-dimethoxy-cyclobut-2-enone

(2R,3R)-3-[(1E,3E)-(tert-butyldimethylsilanyloxy)-methylpenta-1,3-dienyl]-2,3,7,8-tetramethyl-4-triisopropylsilanyloxy-2,3-dihydronaphtho[1,2-b]furan-6,9-dione

4-{(2R,3R)-3-[(Z)-(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