¹H NMR (400 MHz, CDCl₃) δ 9.97 (d, J = 2.5 Hz, 1H), 7.43 – 7.36 (m, 4H), 7.35 – 7.30 (m, 2H), 7.25 (dd, J = 6.1, 4.6 Hz, 4H), 4.91 (d, J = 2.3 Hz, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 198.48, 136.30, 129.13, 128.96, 127.59, 64.08. GC-MS (m/z): 196。