Showing structure for methyl 9-[4-(methoxycarbonyl)-4,7,11b-trimethyl-1h,2h,3h,4ah,5h,6h,6ah,11h,11ah-phenanthro[3,2-b]furan-7-yl]-4,7,11b-trimethyl-1h,2h,3h,4ah,5h,6h-phenanthro[3,2-b]furan-4-carboxylate