InChI=1/C13H14F2N2O4/c14-8-4-5-9(17(20)21)11(10(8)15)16-13(12(18)19)6-2-1-3-7-13/h4-5,16H,1-3,6-7H2,(H,18,19)/p-1/fC13H13F2N2O4/q-1 B56C9E2A209AC6C9