InChI=1S/C17H18N2O6/c20-14-2-1-10(9-15(14)21)3-5-18-6-4-11-7-12(16(22)23)19-13(8-11)17(24)25/h1-2,4,6-7,9,13,19-21H,3,5,8H2,(H,22,23)(H,24,25)/b11-4-,18-6-