1,3,7-Naphthalenetriol,4-[2-(acetyloxy)-3-hydroxy-3-methyl-4-pentenyl]-4a-[(acetyloxy)methyl]decahydro-3,8,8-trimethyl-,1,3,7-triacetate, [1R-[1a,3b,4a(2R*,3S*),4aa,7b,8ab]]-