NMR:
1H NMR (600 MHz, DMSO-d6) δ 9.89 (s, 1H), 9.54 (s, 1H), 8.53 (t, J = 5.8 Hz, 1H), 8.19 (t, J = 1.9 Hz, 1H), 8.00 (s, 1H), 7.89 (d, J = 8.2 Hz, 1H), 7.84 – 7.78 (m, 1H), 7.74 (ddd, J = 7.8, 1.9, 1.1 Hz, 1H), 7.56 (d, J = 1.5 Hz, 1H), 7.46 (t, J = 7.8 Hz, 1H), 7.11 (dd, J = 8.3, 1.4 Hz, 1H), 4.79 (dq, J = 11.1, 7.5, 5.6 Hz, 1H), 4.44 (d, J = 5.7 Hz, 2H), 4.05 – 3.98 (m, 2H), 3.83 (t, J = 8.6 Hz, 2H), 3.70 – 3.61 (m, 2H), 3.58 – 3.49 (m, 2H), 3.43 – 3.37 (m, 1H), 2.53 (s, 3H), 2.15 (tq, J = 11.0, 5.1, 4.5 Hz, 4H);
13C NMR (151 MHz, CD3OD) δ 204.39, 173.77, 141.82, 138.10, 137.05, 133.83, 130.94, 129.54, 127.37, 126.78, 125.21, 124.04, 121.64, 121.03, 117.80, 110.41, 74.53, 59.34, 53.29, 47.54, 45.09 (d, J = 14.4 Hz), 35.82, 33.42
