Showing structure for (2r,3'r,4'ar,5's,6'r,6'ar,10'ar,10'br)-5',6'-bis(acetyloxy)-4'a,10'b-dimethyl-5''-oxo-octahydrodispiro[oxirane-2,7'-naphtho[2,1-b]pyran-3',3''-oxolan]-6'a-ylmethyl acetate