(2Z)-2-(4-nitrobenzylidene)-1-benzofuran-3(2H)-one 3(2H)-benzofuranone, 2-[(4-nitrophenyl)methylene]-, (2Z)- InChI=1/C15H9NO4/c17-15-12-3-1-2-4-13(12)20-14(15)9-10-5-7-11(8-6-10)16(18)19/h1-9H/b14-9