InChI=1/C21H20N2O6/c1-3-10-27-17-7-4-15(5-8-17)13-22(2)21(24)9-6-16-11-19-20(29-14-28-19)12-18(16)23(25)26/h3-9,11-12H,1,10,13-14H2,2H3/b9-6+ 99B65B9CBF1098E7