9-(tert-butyl-dimethyl-silanyloxy)-7-(5-hydroxy-2-methoxy-1,3-dimethyl-pent-3-enyl)-10,14-dimethyl-6,16-dioxa-bicyclo[13.3.1]nonadeca-3,10,12-triene-5,17-dione

9-(tert-butyl-dimethyl-silanyloxy)-7-[5-(tert-butyl-diphenyl-silanyloxy)-2-methoxy-1,3-dimethyl-pent-3-enyl]-10,14-dimethyl-6,16-dioxa-bicyclo[13.3.1]nonadeca-3,10,12-triene-5,17-dione