InChI=1S/C18H13NO9/c20-8-4-11(22)14-12(5-8)28-17(16(26)15(14)25)7-1-2-9(10(21)3-7)18(27)19-6-13(23)24/h1-5,20-22,26H,6H2,(H,19,27)(H,23,24)