熔点: 157.9-161.0 oC,1H NMR (400 MHz, CDCl3) δ 8.64 (d, J = 8.4 Hz, 2H), 8.27 (s, 1H), 8.23 (d, J = 8.4 Hz, 2H), 8.14 (d, J = 8.3 Hz, 2H), 7.92 (d, J = 8.3 Hz, 2H). 13C{1H} NMR (101 MHz, CDCl3) δ 178.00, 166.56, 166.17, 138.09, 137.62, 134.68, 134.01, 130.91, 130.49, 130.31, 130.02, 129.66, 125.74 124.47, 52.57, 52.29. HRMS (ESI) (M+H)+ Calcd. for C20H16NO6: 366.0973, Found: 366.0970.