(1S,4R,4aS,7R,8S,8aR)-7-Allyl-8-(tert-butyl-dimethyl-silanyloxy)-4,4a,6,7,8,8a-hexahydro-1H-1,4-methano-naphthalen-5-one

(4S,8aR,12S,12aR)-12-[[(1,1-dimethylethyl)diphenylsilyl]oxy]-4,5,6,7,8,8a,12,12a-octahydro-4-methyl-2H-3-benzoxecin-2,9(1H)-dione

(Z)-(4S,4aR,8S,12aR)-4-(tert-Butyl-diphenyl-silanyloxy)-8-methyl-4a,5,8,9,12,12a-hexahydro-4H-7-oxa-benzocyclodecene-1,6-dione

(Z)-(1R,4S,4aR,8S,12aR)-4-(tert-Butyl-diphenyl-silanyloxy)-1-hydroxy-8-methyl-1,4,4a,5,8,9,12,12a-octahydro-7-oxa-benzocyclodecen-6-one

(4S,4aR,8S,12aR)-4-(tert-Butyl-diphenyl-silanyloxy)-8-methyl-decahydro-7-oxa-benzocyclodecene-1,6-dione