InChI=1S/C18H20N2O6/c1-26-16-10-11(2-3-15(16)21)4-6-19-7-5-12-8-13(17(22)23)20-14(9-12)18(24)25/h2-3,5,7-8,10,14,20-21H,4,6,9H2,1H3,(H,22,23)(H,24,25)/b12-5-,19-7-/t14-/m0/s1