2H-1-benzopyran-2-one, 3-(3,4-dimethoxyphenyl)-6,7-dimethoxy- 3-(3,4-dimethoxyphenyl)-6,7-dimethoxy-2H-chromen-2-one InChI=1/C19H18O6/c1-21-14-6-5-11(8-16(14)22-2)13-7-12-9-17(23-3)18(24-4)10-15(12)25-19(13)20/h5-10H,1-4H