InChI=1/C15H14N2O3/c1-10-5-4-6-11(14(10)19)9-16-17-15(20)12-7-2-3-8-13(12)18/h2-9,18-19H,1H3,(H,17,20)/b16-9+/f/h17H 3E23A9013C503F61