¹H NMR (400 MHz, CDCl₃) δ 7.50 (d, J = 7.6 Hz, 2H), 7.38-7.34 (m, 2H), 7.30 (d, J = 6.5 Hz, 1H), 5.40 (s, 1H), 5.11 (s, 1H), 2.19 (s, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 143.3, 141.2, 128.2, 127.4, 125.5, 112.4, 21.8。