((6a'R,7'S,9a'S,Z)-7'-(hydroxymethyl)-5-methyl-3',6',6a',7',9',9a'-hexahydrodispiro[[1,3]dioxane-2,2'-cyclopenta[b]oxocine-8',2''-[1,3]dithiolan]-5-yl)methyl benzoate

(7S,8R,9S)-9-(tert-Butyl-diphenyl-silanyloxymethyl)-8-[(Z)-4-(4-methyl-2,6,7-trioxa-bicyclo[2.2.2]oct-1-yl)-but-2-enyl]-1,4-dithia-spiro[4.4]nonan-7-ol