“…1 H NMR (DMSO, 400 MHz) δ 3.10 (dd, 1H, J = 10.7 Hz, J = 13.7 Hz), 3.22 (dd, 1H, J = 4.4 Hz, J = 13.8 Hz), 4.63–4.69 (m, 1H), 7.16–7.20 (m, 1H), 7.25–7.29 (m, 2H), 7.33–7.34 (m, 2H), 7.42–7.46 (m, 2H), 7.50–7.54 (m, 1H), 7.80–7.82 (m, 2H), 8.72 (d, 1H, J = 8.2 Hz); C NMR (DMSO, 100 MHz) δ 36.34, 54.30, 126.43, 127.41, 128.26, 128.31, 129.13, 131.43, 133.99, 138.27, 166.48, 173.31; LC/MS r t : 1.53; MS (ESI+): m/z 284.2 ([M + H] + ); HRMS (ESI+) m/z: Calcd for [C 16 H 15 NO 3 + H] + : 270.1130, found: 270.1129. Spectral data were consistent with those previously reported in the literature …”