InChI=1S/C18H12Cl2N2O3/c19-10-8-13(20)16-12(17(18(24)25)22-14(16)9-10)6-7-15(23)21-11-4-2-1-3-5-11/h1-9,22H,(H,21,23)(H,24,25)/b7-6+