InChI=1S/C16H20N2O6/c19-8-11-13(20)14(21)15(22)16(24-11)23-10-3-1-9(2-4-10)7-12-17-5-6-18-12/h1-6,11,13-16,19-22H,7-8H2,(H,17,18)