1H NMR (400 MHz, CDCl3) δ 7.27 (d, J = 7.2 Hz, 1H), 7.22 (t, J = 7.0 Hz, 2H), 7.16 (d, J = 6.4 Hz, 1H), 6.65 (d, J = 15.9 Hz, 1H), 5.92 (d, J = 15.9 Hz, 1H), 1.42 (s, 6H). 13C{1H} NMR (101 MHz, CDCl3) δ 135.65, 130.29, 129.74, 128.59, 128.05, 126.47, 123.33, 34.82, 27.56. GC-MS (m/z) = 171.