InChI=1/C16H12N2O3/c17-10-12(9-11-1-5-14(19)6-2-11)16(21)18-13-3-7-15(20)8-4-13/h1-9,19-20H,(H,18,21)/b12-9-/f/h18H 1F3AE04F3388A52A