Showing structure for 13'-hydroxy-5'-methoxy-6-methyl-7'-(2-oxoheptyl)-2',10',16'-trioxaspiro[oxane-2,17'-tetracyclo[9.8.0.0³,⁸.0¹⁴,¹⁹]nonadecane]-1'(19'),3'(8'),4',6',11',13'-hexaene-9',15'-dione