(3Z)-3-[(2E)-pent-2-en-1-ylidene]-2-benzofuran-1(3H)-one 1(3H)-isobenzofuranone, 3-[(2E)-2-pentenylidene]-, (3Z)- InChI=1/C13H12O2/c1-2-3-4-9-12-10-7-5-6-8-11(10)13(14)15-12/h3-9H,2H2,1H3/b4-3+,12-9