1H NMR (400 MHz, CDCl3) δ 8.22 (d, J = 8.6 Hz, 1H), 8.17 (d, J = 8.5 Hz, 1H), 8.12 (d, J = 8.1 Hz, 2H), 7.83 (d, J = 8.8 Hz, 2H), 7.74 (t, J = 7.7 Hz, 1H), 7.56 – 7.49 (m, 3H). 13C NMR (100 MHz, CDCl3) δ 156.0, 148.2, 138.0, 137.0, 135.6, 129.9, 129.7, 129.0, 128.9, 127.5, 127.2, 126.6, 118.6.