(4aS,6R,8S,9aR)-6-((2S,3R,5S,6R)-5-Benzyloxy-6-benzyloxymethyl-3-triethylsilanyloxy-tetrahydro-pyran-2-ylmethyl)-8-(tert-butyl-dimethyl-silanyloxy)-hexahydro-1,5-dioxa-benzocyclohepten-7-one

(4aS,6R,8S,9aR)-6-((2S,3R,5S,6R)-5-Benzyloxy-6-benzyloxymethyl-3-triethylsilanyloxy-tetrahydro-pyran-2-ylmethyl)-8-triisopropylsilanyloxy-hexahydro-1,5-dioxa-benzocyclohepten-7-one