“…J = 8.6 Hz, H Ar ), 7.73 (d, 2H, J = 8.7 Hz, H Ar ), 12.33 (s, 1H, OH);13 C NMR (CDCl 3 ) δ: 37.5 (CH 2 ), 52.1 (OCH 3 ), 52.6 (OCH 3 ), 55.5 (CHCO), 62.0 (CHAr 2 ), 112.5, 120.0, 121.2, 122.7, 126.7, 128.0, 128.2, 128.7, 128.8, 129.1, 130.1, 132.9, 140.2, 156.6 (C Ar ), 170.9 (CO), 173.0 (CO); elementar analysis: C 23 H 23 NO 5 (393.44 g/mol) calculated: C% 70.21, H% 5.89, N% 3.56; found: C% 70.02, H% 5.96, N% 3.61.…”