Showing structure for (3as,3bs,4s,5as,9as,9br,10s)-4-(acetyloxy)-3b,6,6,9a-tetramethyl-1-oxo-3h,3ah,4h,5h,5ah,7h,8h,9h,9bh,10h-phenanthro[1,2-c]furan-10-yl acetate