InChI=1S/C19H16N2O6/c1-2-9-5-11(13(23)7-12(9)22)17-16(18(19(24)25)21-20-17)10-3-4-14-15(6-10)27-8-26-14/h3-7,22-23H,2,8H2,1H3,(H,20,21)(H,24,25)