1H NMR (400 MHz, CDCl3) δ 7.26 (s, 1H), 7.13 (s, 3H), 6.59 (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 137.53, 134.55, 131.81, 129.86, 128.56, 128.02, 126.29, 124.90, 123.07, 34.91, 27.50n. GC-MS (m/z) = 205.