¹H NMR (400 MHz, CDCl₃) δ 10.62 (s, 1H), 9.30 (d, J = 9.2 Hz, 1H), 8.15 (d, J = 7.5 Hz, 1H), 8.10 (s, 1H), 8.03 (d, J = 9.2 Hz, 1H), 7.98 (td, J = 7.1, 3.5 Hz, 2H), 7.93 (d, J = 8.3 Hz, 2H), 7.83 (d, J = 8.7 Hz, 1H), 7.78 (d, J = 7.5 Hz, 1H), 7.65 – 7.61 (m, 2H), 7.50 (t, J = 7.4 Hz, 1H), 7.41 (d, J = 8.4 Hz, 1H), 7.07 (t, J = 7.8 Hz, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 193.20, 146.58, 142.25, 133.96, 133.95, 133.08, 132.72,132.38, 130.72, 130.69, 130.44, 129.86, 129.40, 128.80, 128.61, 128.23, 128.22, 127.90, 127.28, 126.80, 126.72, 126.57, 126.44, 125.28, 122.00.