(2Z)-4,6,7-trimethoxy-2-(2-methoxybenzylidene)-1-benzofuran-3(2H)-one 3(2H)-benzofuranone, 4,6,7-trimethoxy-2-[(2-methoxyphenyl)methylene]-, (2Z)- InChI=1/C19H18O6/c1-21-12-8-6-5-7-11(12)9-14-17(20)16-13(22-2)10-15(23-3)18(24-4)19(16)25-14/h5-10H,1-4H3/b14-9