InChI=1/C18H16N4O/c1-21-14-9-8-13(10-15(14)22(2)18(21)23)17-16(19-11-20-17)12-6-4-3-5-7-12/h3-11H,1-2H3,(H,19,20)/f/h19H 24610A05E38B0D48