1H NMR (400 MHz, CDCl3) δ 9.79 (s, 1H), 7.96 – 7.83 (m, 3H), 7.60 – 7.52 (m, 2H), 7.49 (t, J = 7.6 Hz, 1H), 7.41 (d, J= 6.9 Hz, 1H), 4.10 (d, J = 1.9 Hz, 2H). 13C NMR (101 MHz, CDCl3) δ 199.44, 133.84, 132.19, 128.81, 128.36, 128.30, 126.60, 125.97, 125.54, 123.45, 104.20, 48.20. GC-MS (m/z): 170。
