InChI=1/C21H17N3O4/c1-21(16-9-11-17(12-10-16)24(27)28)19(25)23(20(26)22-21)13-15-7-4-6-14-5-2-3-8-18(14)15/h2-12H,13H2,1H3,(H,22,26)/t21-/m0/s1/f/h22H A88F23893923CAC6