InChI=1S/C18H12O7/c19-11-3-2-8-6-9-13-7(5-10(14(9)21)18(23)24)1-4-12(20)17(13)25-16(8)15(11)22/h1-4,6,10,19-20,22H,5H2,(H,23,24)