InChI=1/C18H16N4O/c1-22-18(12-6-8-19-9-7-12)16(11-20-22)14-2-4-15-13(10-14)3-5-17(15)21-23/h2,4,6-11,23H,3,5H2,1H3/b21-17+ 166927AF1F303D52