1H NMR (400 MHz, CDCl3) δ 7.37 (d, J = 7.9 Hz, 2H), 7.31 (d, J = 7.8 Hz, 2H), 6.80 (s, 1H), 2.49 (s, 3H), 1.32 (s, 12H). 13C{1H} NMR (101 MHz, CDCl3) δ 151.09, 138.86, 136.63, 127.52, 125.24, 97.24, 34.51, 31.22, 16.61. GC-MS (m/z) = 332.