InChI=1S/C21H15N3O6/c25-10-1-4-13(16(28)7-10)19-22-20(14-5-2-11(26)8-17(14)29)24-21(23-19)15-6-3-12(27)9-18(15)30/h1-9,22-24,28-30H/b19-13-,20-14+,21-15-