1H NMR (400 MHz, CDCl3) δ 7.98 (d, J = 13.7 Hz, 1H), 7.56 (dd, J = 11.1, 7.8 Hz, 3H), 7.20 (d, J = 8.6 Hz, 2H), 2.32 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 168.84, 153.45, 137.96, 137.07, 130.37 127.60, 122.71, 21.08. GC-MS (m/z): 207.