1H NMR (400 MHz, CDCl3) δ 10.46 (s, 1H), 9.46 (d, J = 8.8 Hz, 1H), 8.25 (s, 1H), 8.05 (d, J = 7.1 Hz, 1H), 7.99 (d, J = 8.8 Hz, 1H), 7.78 (d, J = 7.5 Hz, 2H), 7.72 (d, J = 7.5 Hz, 2H), 7.64 (t, J = 9.9 Hz, 5H), 7.44 (ddd, J = 26.3, 17.2, 7.3 Hz, 6H). 13C NMR (101 MHz, CDCl3) δ 193.28, 147.29, 141.05, 140.59, 140.46, 139.63, 138.75, 136.03, 132.41, 130.59, 130.29, 128.94, 128.47, 127.70, 127.66, 127.46, 127.26, 127.16, 126.61, 125.71, 124.51.