InChI=1/C17H16N2O4/c1-2-14(11-3-6-13(20)7-4-11)18-19-17(21)12-5-8-15-16(9-12)23-10-22-15/h3-9,20H,2,10H2,1H3,(H,19,21)/b18-14+/f/h19H DFF8666DE084F972