InChI=1S/C21H24N2O7/c24-11-17-18(26)19(27)20(28)21(30-17)29-16-9-13-4-8-23(14(13)10-15(16)25)7-3-12-1-5-22-6-2-12/h1-3,5-7,9-10,17-21,24-28H,4,8,11H2/b7-3+/t17-,18-,19+,20-,21?/m1/s1