(4aR,4bS,5S,6aS,7aR,11aR,12aS,12bS)-5,7a-dihydroxy-4a,6a-dimethyl-10-propyl-4b,5,6,6a,7a,8,11a,12,12a,12b,13,14-dodecahydro-2H-chryseno[3,2-d][1,3]dioxine-2,7(4aH)-dione