NMR:
1H NMR (400 MHz, DMSO-d6): δ = 8.22 (d, J = 4.55 Hz, 1H), 7.94 (s, 1H), 7.75 (t, J = 6.06 Hz, 1H), 7.69 (s, 1H), 7.60 (dd, J = 1.52, 8.08 Hz, 1H), 7.24 (dt, J = 2.15, 8.91 Hz, 1H), 7.16 (d, J = 8.08 Hz, 1H), 7.06–7.13 (m, 1H), 6.19 (s, 1H), 3.89 (s, 3H), 3.62 (q, J = 6.15 Hz, 2H), 2.74–2.82 (m, 1H), 2.62–2.74 (m, 2H), 2.09 (s, 3H), 0.59–0.70 (m, 2H), 0.42–0.51 (m, 2H).
13C NMR (151 MHz, DMSO-d6): δ = 169.8, 161.0, 146.3, 144.1, 143.8, 140.7, 135.6, 135.2, 134.2, 133.4, 129.4, 127.0, 126.9, 122.6, 118.1, 108.1, 81.2, 56.7, 35.5, 31.8, 22.7, 19.2, 5.8.
