“…m.p. : 185 °C , ); Rf = 0.46 (hexane/ethyl acetate 4:1); 1 H NMR (400 MHz, DMSO) δ: 2.29 (s, 3H, −CH 3 ), 6.05 (dd, J = 1.2 Hz, 1H arom ), 6.63 (dd, J = 2.4 Hz, 1H arom ), 6.74 (dd, J = 2.4 Hz, 1H arom ), 7.50 (dd, J = 8.8 Hz, 1H arom ), 10.42 (bs, −OH), ppm. 13 C NMR (100 MHz, DMSO-d6) δ: 18.56, 102.64, 110.70, 112.47, 113.32, 127.06, 154, 155.30, 160.76, 161.63, ppm.…”