NMR:
1H NMR (500 MHz, DMSO-d6) 11.83 (s, 1H), 10.94 (s, 1H), 10.41 (s, 1H), 8.53 (s, 1H), 8.44 (s, 1H), 8.25 (s, 1H), 7.67 (d, J = 7.0 Hz, 1H), 7.52 (d, J = 8.0 Hz, 1H), 7.36 (d, J = 8.5 Hz, 2H), 7.22 (t, J = 8.0 Hz, 1H), 7.16 (d, J = 8.0 Hz, 1H), 6.83 (m, 1H), 6.52 (d, J = 15.0 Hz, 1H), 4.02 (br, 2H), 3.93-3.80 (m, 3H), 3.20 (br, 2H), 2.80 (s, 6H), 2.10 (m, 1H), 1.86 (m, 1H), 1.71 (m, 1H), 1.61 (m, 1H).
13C NMR (126 MHz, DMSO) δ 169.89, 162.78, 160.36, 157.54, 153.27, 140.36, 136.78, 132.99, 132.70, 131.99, 131.65, 128.11 (2C), 126.74, 123.20, 122.96, 121.69, 119.42 (2C), 113.66, 112.59, 111.53, 57.19, 49.12, 48.30, 45.07, 42.31 (2C), 30.21, 23.51.
