Hexadecanoic acid, (3b,4,5,6,7,8,9,10,10a,10b-decahydro-7-hydroxy-10b-methyl-5a,8-methano-5aH-cyclohepta(5,6)naphtho(2,1-b)furan-7-yl)methyl ester, (3bS-(3balpha,5abeta,7beta,8beta,10aalpha,10bbeta))-