(9-benzyloxy-8-isopropyl-10-methoxymethoxy-5a,7a-dimethyl-3,4,5,5a,6,7,7a,8,9,10,10a,10b-dodecahydro-2H-1-oxa-benzo[cd]cyclopenta[h]azulen-3-yloxy)-tert-butyl-diphenyl-silane