“…13 C NMR (101 MHz) δ: 172.1 (CO), 170.9 (CO), 139.6 (ArC), 128.1 (ArCH), 127.9 (ArCH), 127.7 (ArCH), 82.3 (CuCH), 73.3 (CuCH), 62.8 (NCHAr), 52.4 (CH 3 ), 51.6 (CH 3 ), 51.1 (CHCO), 50.9 (CHCO), 49.9 (NCHCuCH). LRMS (EI) m/z: 287 (M + , 1%), 104 (11), 115 (41), 116 (19), 119 (13), 125 (50), 142 (39), 143 (68), 146 (15), 167 (12), 168 (14), 177 (100), 178 (12), 256 (16). HRMS (ESI) calcd for C 16 H 17 NO 4 : 287.1158; found: 287.1137.…”