InChI=1/C21H17N3O4/c1-21(17-11-10-14-6-2-3-7-15(14)12-17)19(25)23(20(26)22-21)13-16-8-4-5-9-18(16)24(27)28/h2-12H,13H2,1H3,(H,22,26)/t21-/m1/s1/f/h22H FD4FE32F4DE4E14F