InChI=1S/C21H16N4O2/c1-20-19-23-14-8-4-2-6-12(14)18(27)25(19)16(17(26)24-20)10-21(20)11-22-15-9-5-3-7-13(15)21/h2-9,11,16H,10H2,1H3,(H,24,26)/t16-,20+,21-/m1/s1