“…1 H NMR (400 MHz, CDCl 3 ) δ 8.27 (d, J = 9.0 Hz, 1H), 7.28 (d, J = 9.0 Hz, 1H), 2.72 (t, J = 7.3 Hz, 1H), 2.54 (t, J = 7.1 Hz, 1H), 2.15–2.04 (m, 1H); 13 C NMR (101 MHz, CDCl 3 ) δ 178.4, 170.4, 155.3, 125.2, 122.4, 33.2, 32.6, 19.5. NMRs are in accordance with the earlier literature reports [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ].…”