“…mp 254 °C. 1 H NMR (400 MHz, DMSO-d6) δ: 9.38 (dd, J = 7.3, 0.7 Hz, 1H), 8.76 (dd, J = 4.5, 1.6 Hz, 2H), 8.52 -8.46 (m, 1H), 8.01 -7.92 (m, 3H), 7.81 -7.72 (m, 3H), 7.60 (dd, J = 10.7, 4.9 Hz, 2H), 5.27 (s, 2H). 13 C NMR (100 MHz, DMSO-d6) δ: 150.7 (2C), 144.7, 143.0, 140.2, 140.0, 138.9, 134.…”