InChI=1/C19H16N2O/c20-17-12-11-16(14-7-3-1-4-8-14)13-18(17)21-19(22)15-9-5-2-6-10-15/h1-13H,20H2,(H,21,22)/f/h21H 9DF6B3F87BD5F8B3