(2aS,5aS,7S,7aR,8S,10R,10aS,10bS,10cR)-2a,4,4,7,10-Pentamethyl-7,8,10c-tris-trimethylsilanyloxy-octahydro-1,3,5-trioxa-benzo[cd]cyclopenta[h]azulene-2,9-dione

(2aS,2a1R,5aS,7S,7aR,8S,10R,10aS,10bS)-8-hydroxy-2a,4,4,7,10-pentamethyl-2a1,7-bis((trimethylsilyl)oxy)octahydro-1,3,5-trioxabenzo[cd]cyclopenta[h]azulene-2,9(2aH,5aH)-dione