NMR:
1H-NMR (500 MHz, DMSO-d6): δ 9.15 (t, J = 5.9 Hz, 1H), 9.02 (d, J = 6.6 Hz, 1H), 8.36 (s, 1H), 8.07 (ddd, J = 8.6, 6.7, 1.6 Hz, 1H), 7.80 (d, J = 8.8 Hz, 1H), 7.77 (s, 1H), 7.48 – 7.40 (m, 2H), 7.21 (dd, J = 9.3, 1.6 Hz, 1H), 6.90 (s, 1H), 4.61 (d, J = 5.9 Hz, 2H), 3.63 (s, 2H), 2.29 (d, J = 6.6 Hz, 2H), 2.06 (s, 1H), 1.72 (d, J = 12.9 Hz, 2H), 1.67 – 1.56 (m, 3H), 1.41 – 1.31 (m, 1H), 1.22 – 1.04 (m, 3H), 0.88 – 0.78 (m, 2H);
13C-NMR (126 MHz, DMSO-d6): δ 162.7, 157.9, 153.7, 150.5, 143.7, 143.4, 138.5, 127.4, 126.2, 126.1, 125.0, 124.4, 117.3, 115.8, 110.1, 100.8, 55.2, 50.2, 37.7, 37.6, 31.1, 26.3, 25.6;
