(2aR,4S,4aS,6R,9S,11S,12S,12aR,12bS)-9,11-dihydroxy-4,6-dimethoxy-4a,8,13,13-tetramethyl-5-oxo-12b-(propionyloxy)-2a,3,4,4a,5,6,9,10,11,12,12a,12b-dodecahydro-1H-7,11-methanocyclodeca[3,4]benzo[1,2-b]oxet-12-yl benzoate