InChI=1S/C18H18N2O8/c21-11-12(22)14(24)16(28-18(26)10-4-2-6-20-8-10)15(13(11)23)27-17(25)9-3-1-5-19-7-9/h1-8,11-16,21-24H/t11-,12-,13-,14+,15-,16-/m0/s1