¹H NMR (400 MHz, CDCl₃) δ 9.73 (s, 1H), 7.39 – 7.27 (m, 3H), 7.24 – 7.16 (m, 2H), 3.67 (d, J = 1.6 Hz, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 199.35, 131.76, 129.51, 128.88, 127.29, 50.43. GC-MS (m/z): 120。