Showing structure for (1r,3s,4ar,10as)-8-[(1r,3s,4ar,5r,10as)-5,9-dihydroxy-7-methoxy-1,3-dimethyl-10-oxo-1h,3h,4h,4ah,5h,10ah-naphtho[2,3-c]pyran-8-yl]-9-hydroxy-7-methoxy-1,3-dimethyl-1h,3h,4h,4ah,10ah-naphtho[2,3-c]pyran-5,10-dione