1H NMR (400 MHz, CDCl3) δ 8.26 (d, J = 13.6 Hz, 1H), 7.50 (d, J = 13.6 Hz, 1H), 7.32 (s, 1H), 7.22 – 7.14 (m, 2H), 2.42 (s, 3H), 2.34 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 137.22, 136.77, 136.21, 136.17, 132.79, 131.17, 128.57, 127.69, 20.72, 19.28. GC-MS (m/z): 163.