1H NMR (400 MHz, CDCl3) δ 7.47 – 7.26 (m, 2H), 7.01 (t, J = 8.5 Hz, 2H), 5.32 (d, J = 51.4 Hz, 2H), 2.73 (s, 2H), 1.25 (s, 6H). 13C{1H} NMR (101 MHz, CDCl3) δ 162.31 (d, J = 246.9 Hz), 142.87, 137.42 (d, J = 3.3 Hz), 128.00 (d, J = 8.0 Hz), 124.33, 118.36, 115.18 (d, J = 21.4 Hz), 45.48, 32.75, 26.90. GC-MS (m/z) = 203.