1H NMR (400 MHz, CDCl3) δ 7.59 (d, J = 6.6 Hz, 1H), 7.46 – 7.33 (m, 6H), 7.29 (dd, J = 16.7, 7.6 Hz, 2H), 7.21 (d, J = 9.3 Hz, 3H), 7.14 (t, J = 9.4 Hz, 1H). 13C NMR (101 MHz, CDCl3) δ 196.15, 155.77, 145.05, 133.77, 133.57, 132.46, 131.25, 131.15, 130.65, 129.93, 129.53, 129.23, 129.17, 128.96, 128.39, 123.10, 121.42.