InChI=1S/C18H15N5/c19-15(12-4-2-1-3-5-12)13-6-8-14(9-7-13)16-17-18(22-10-20-16)23-11-21-17/h1-11,15H,19H2,(H,20,21,22,23)/t15-/m0/s1