¹H NMR (400 MHz, CDCl₃) δ 9.78 (s, 1H), 7.49 – 7.43 (m, 1H), 7.33 – 7.23 (m, 3H), 3.87 (s, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 198.21, 134.53, 131.69, 130.70, 129.68, 129.06, 127.19, 48.20. GC-MS (m/z): 154。