InChI=1S/C19H26N2O9/c20-7-1-2-8-21-13(23)6-4-10-3-5-11(9-12(10)22)29-19-16(26)14(24)15(25)17(30-19)18(27)28/h3-6,9,14-17,19,22,24-26H,1-2,7-8,20H2,(H,21,23)(H,27,28)/b6-4+