InChI=1S/C17H18N2O9/c18-7-9(8-4-2-1-3-5-8)19-10(20)6-11(21)27-17-14(24)12(22)13(23)15(28-17)16(25)26/h1-5,9,12-15,17,22-24H,6H2,(H,19,20)(H,25,26)