1H NMR (400 MHz, CDCl3) δ 7.35 (t, J = 7.5 Hz, 2H), 7.23 (d, J = 7.8 Hz, 3H), 6.72 (s, 1H), 1.93 (s, 3H), 1.59 (s, 6H). 13C{1H} NMR (101 MHz, CDCl3) δ 137.08, 136.89, 128.97, 128.17, 126.84, 126.06, 124.19, 39.24, 26.39, 14.22. HRMS (ESI) m/z calcd for C13H15NNa+ [M+Na]+: 208.1097, found 208.1094.