1H NMR (400 MHz, CDCl3) δ 7.48 (d, J = 7.2 Hz, 4H), 7.42 – 7.30 (m, 6H), 3.62 (t, J = 7.2 Hz, 2H), 1.79 – 1.66 (m, 2H), 0.97 (t, J = 7.4 Hz, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 170.8, 136.1, 129.9, 129.7, 128.7, 128.5, 40.0, 21.9, 11.3.