InChI=1S/C19H14O8/c20-15-12-7-6-11(27-17(19(24)25)16(21)18(22)23)8-14(12)26-9-13(15)10-4-2-1-3-5-10/h1-9,16-17,21H,(H,22,23)(H,24,25)