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