InChI=1/C21H16N2O/c24-21-17-9-4-10-18-19(17)16(11-12-22-21)20(23-18)15-8-3-6-13-5-1-2-7-14(13)15/h1-10,23H,11-12H2,(H,22,24)/f/h22H 52FBD0818933D1E1