InChI=1S/C18H14O8/c19-11-6-10-7-16(18(24)26-15(10)8-12(11)20)25-14-3-1-9(5-13(14)21)2-4-17(22)23/h1,3,5-8,19-21H,2,4H2,(H,22,23)