(2Z)-2-benzylidene-4,6-dimethoxy-1-benzofuran-3(2H)-one 3(2H)-benzofuranone, 4,6-dimethoxy-2-(phenylmethylene)-, (2Z)- InChI=1/C17H14O4/c1-19-12-9-13(20-2)16-14(10-12)21-15(17(16)18)8-11-6-4-3-5-7-11/h3-10H,1-2H3/b15-8