(3R,5S,6S)-6-((2R,3S,5R,2'S,5'R,2''S)-5''-Bromomethyl-2'-ethyl-3,2'',5''-trimethyl-dodecahydro-[2,2';5',2'']terfuran-5-yl)-3,5-dimethyl-tetrahydro-pyran-2-one