1H NMR (400 MHz, CDCl3) δ 7.48 – 7.30 (m, 5H), 5.68 (s, 1H), 5.21 (s, 1H), 3.08 (s, 3H), 2.01 (s, 3H). 13C NMR (101 MHz, CDCl3) δ 170.91, 148.93, 135.39, 129.09, 128.88, 125.54, 112.24, 35.43, 21.70. GC-MS (m/z): 175。