3-[2,3-Dihydro-3-[(4-methoxyphenyl)methylene]-2-oxobenzofuran-5-yl]propenoic acid

(2E)-3-[(3Z)-3-(4-Methoxybenzylidene)-2-oxo-2,3-dihydro-1-benzofuran-5 -yl]-2-propenoic acid