Showing structure for methyl (3ar,3bs,7s,9as,11ar)-7-(acetyloxy)-9a-formyl-1-methoxy-2,3b,6,6,11,11a-hexamethyl-3-oxo-4h,5h,5ah,7h,8h,9h,9bh-cyclopenta[a]phenanthrene-3a-carboxylate