InChI=1S/C18H18N2O9/c1-9-7-29-17(19-13(9)16(26)27)18(8-21,28-2)20-14(23)12(15(24)25)10-3-5-11(22)6-4-10/h3-6,8,12,17,22H,1,7H2,2H3,(H,20,23)(H,24,25)(H,26,27)/t12-,17+,18-/m0/s1