InChI=1/C18H20N2O3/c1-12-7-16-17(23-11-22-16)9-13(12)8-14(10-19)18(21)20-15-5-3-2-4-6-15/h7-9,15H,2-6,11H2,1H3,(H,20,21)/b14-8-/f/h20H AF9C6B535EC0405C