InChI=1/C19H17N3O4/c23-16-11-26-18-14(20-16)7-4-8-15(18)21-19(25)12-9-17(24)22(10-12)13-5-2-1-3-6-13/h1-8,12H,9-11H2,(H,20,23)(H,21,25)/t12-/m1/s1/f/h20-21H 941FD0A631F2E61E