1H NMR (400 MHz, CDCl3) δ 7.27 (d, J = 7.7 Hz, 2H), 6.82 (d, J = 7.7 Hz, 2H), 6.65 (d, J = 15.9 Hz, 1H), 5.86 (d, J = 15.9 Hz, 1H), 3.74 (s, 3H), 1.47 (s, 6H). 13C{1H} NMR (101 MHz, CDCl3) δ 159.36, 128.96, 128.20, 127.98, 127.56, 123.41, 113.85, 55.01, 34.59, 27.48. GC-MS (m/z) = 201.