InChI=1S/C17H18N2O9/c18-6-8(7-4-2-1-3-5-7)19-15(23)9(16(24)25)13-11(21)10(20)12(22)14(28-13)17(26)27/h1-5,8-14,20-22H,(H,19,23)(H,24,25)(H,26,27)