InChI=1S/C22H18N4O4/c1-12-18(27)26-16-9-5-3-7-14(16)22(30)10-17(20(29)25(12)21(22)26)24-11-23-15-8-4-2-6-13(15)19(24)28/h2-9,11-12,17,21,30H,10H2,1H3/t12-,17+,21-,22-/m0/s1