dH (400 MHz, DMSO-d6) 12.64 (1H, br s, COOH), 8.73 (1H, d, J 7.44, NH), 8.14 (2H, d, J 7.60, HAr), 8.24 (2H, d, J 8.24, HAr), 7.42 (2H, ddd, J 8.20, 7.12, 1.12, HAr), 7.22-7.18 (2H, m, HAr), 5.12 (1H, d, J 17.21, NCHaHb), 5.02 (1H, d, J 16.81, NCHaHb), 4.25 (1H, pseudo-quintet, J 7.30, CH*), 1.33 (3H, d, J 7.28, CH3). dC (100 MHz, DMSO-d6) 173.89 and 167.29 (C=O), 140.64, 125.62, 122.22, 120.10, 118.96, and 109.40 (CAr), 47.67 (CH*), 45.28 (NCH2), 17.36 (CH3). HRMS (ESI) m/z: [M+Na]+ calcd for C17H16N2NaO3 319.1053; found 319.1047.