InChI=1S/C18H18N2O9/c1-8-7-29-17-18(28-2,16(27)20(17)12(8)15(25)26)19-13(22)11(14(23)24)9-3-5-10(21)6-4-9/h3-6,11,17,21H,7H2,1-2H3,(H,19,22)(H,23,24)(H,25,26)/t11-,17+,18-/m0/s1