(3E)-3-[(2E)-3-phenylbut-2-en-1-ylidene]-2-benzofuran-1(3H)-one 1(3H)-isobenzofuranone, 3-[(2E)-3-phenyl-2-butenylidene]-, (3E)- InChI=1/C18H14O2/c1-13(14-7-3-2-4-8-14)11-12-17-15-9-5-6-10-16(15)18(19)20-17/h2-12H,1H3/b13-11+,17-12