Hexadecanoic acid, 1a,2,5,5a,6,9,10,10a-octahydro-5,5a-dihydroxy-4-(hydroxymethyl)-1,1,7,9-tetramethyl-11-oxo-1H-2,8a-methanocyclopenta(a)cyclopropa(e)cyclodecen-6-yl ester, (1aR-(1aalpha,2beta,5beta,5abeta,6beta,8aalpha,9alpha,10aalpha))-