Showing structure for (4ar,5r,6s,6ar,7r,11ar,11br)-6-(acetyloxy)-4a,7-dihydroxy-4,4,7,11b-tetramethyl-1-oxo-2h,3h,5h,6h,6ah,11h,11ah-phenanthro[3,2-b]furan-5-yl acetate