1H-2-benzopyran-1-one, 5,7-dimethoxy-4-phenyl- 5,7-dimethoxy-4-phenyl-1H-isochromen-1-one InChI=1/C17H14O4/c1-19-12-8-13-16(15(9-12)20-2)14(10-21-17(13)18)11-6-4-3-5-7-11/h3-10H,1-2H