[2R-(2α(2S*(2'S*,3a'R*,4'R*,7'R*,7a'R*),3Ξ*),3aα,4β,7β,7aα)]-2,4-Bis[(octahydro-7,8,8-trimethyl-4,7-methanobenzofuran-2-yl)oxy]-1,3-butandiol