InChI=1S/C19H26N2O8/c20-9-1-2-10-21-13(22)8-5-11-3-6-12(7-4-11)28-19-16(25)14(23)15(24)17(29-19)18(26)27/h3-8,14-17,19,23-25H,1-2,9-10,20H2,(H,21,22)(H,26,27)/b8-5+