[1S-[1α[2S*,4S*[βS*,δS*[1R*,2R*,6S*,8R*(R*)]]],2α,6β,8δ(R*)]]-1,2,6,7,8,8a-Hexahydro-.beta.,.delta.-dihydroxy-2,6-dimethyl-8-(2-methyl-1-oxobutoxy)-1-naphthaleneheptanoic Acid 2-[[1,2,6,7,8,8a-Hexahydro-2,6-dimethyl-8-(2-methyl-1-oxobutoxy)-1- naphthalenyl]ethyl]tetrahydro-6-oxo-2H-pyran-4-yl Ester; L 665624;