IR-ATR: 3330, 3231, 3116, 2936-2866, 1663, 1596, 1498, 1458, 1280, 1230, 1177, 1041, 681 cm-1. 1H NMR (300 MHz, DMSO-d6): ppm = 9.54 (s, 2H, NH), 9.43 (s, 2H, NH), 8.73 (s, 2H, NH), 7.69 (s, 2H, CHAr), 7.55-7.46 (m, 4H, CHAr), 7.14 (d, 2H, J = 8.47 Hz, CHAr), 7.01 (s, 2H, CHAr), 6.87 (s, 2H, CHAr), 5.46 (br s, 2H, OH), 5.36 (s, 2H, CH), 3.75 (s, 6H, OCH3), 2.80 (s, 4H, CH2CH2), 2.07 (s, 6H, CH3).
13C NMR (75 MHz, DMSO-d6): ppm = 165.66, 152.92, 149.00, 143.44, 138.47, 137.39, 136.84, 136.56, 128.86, 122.17, 120.13, 109.67, 109.48, 105.67, 56.49, 54.97, 37.05, 17.50.