InChI=1/C20H15N3O4/c1-22-15-8-4-3-7-13(15)16(11-18(22)25)23-20(27)14(19(26)21-23)10-12-6-2-5-9-17(12)24/h2-11,24H,1H3,(H,21,26)/b14-10+/f/h21H 8E926BFFD58573DF