InChI=1S/C20H10Cl2N2O2/c21-15-13-17(23-11-7-3-1-5-9(11)19(13)25)16(22)14-18(15)24-12-8-4-2-6-10(12)20(14)26/h1-8H,(H,23,25)(H,24,26)