¹H NMR (400 MHz, CDCl₃) δ 9.75 (s, 1H), 7.40 – 7.26 (m, 2H), 7.23 – 7.17 (m, 1H), 7.10 (d, J = 5.0 Hz, 1H), 3.68 (s, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 198.37, 134.77, 133.73, 130.16, 129.71, 127.76, 127.65, 49.97. GC-MS (m/z): 154。