“…The methyl ester of 26a (0.26 g, 0.72 mmol), dissolved in THF (10 mL), was hydrolyzed with 0.1 N NaOH (14.5 mL, 1.45 mmol) to give 26a (0.24 g, 96% yield) as off-white crystals after recrystallization from EtOH-water: mp 144-145 °C; 1 H NMR (300 MHz, DMSO-d6) δ 13.08 (bs, 1 H), 8.90 (s, 1 H), 7.81 (dt, J ) 4.5, 0.9 Hz, 1 H), 7.66 (d, J ) 4.2 Hz, 2 H), 7.27-7.19 (m, 2 H), 6.97-6.89 (m, 2 H), 4.83 (q, J ) 6.6 Hz, 1 H), 1.50 (d, J ) 6.6 Hz, 3 H); 13 C NMR (75 MHz, DMSO-d6) δ 173. 5, 157.9, 155.4, 146.3, 141.0, 140.6, 135.8, 132.4, 131.1, 127.9, 126.9, 122.9, 116.1, 72.4, 18.7; IR (KBr) 3400 (OH), 1685 (CdO) cm -1 ; MS (EI) m/z (%) 344 (M + , 100), 299 (16), 285 (12), 272 (31), 255 (7), 243 (82), 215 (6), 208 (8), 193 (12), 181 (6), 163 (61), 152 (5), 136 (26), 127 (22), 124 (8), 116 (10), 109 (18), 100 (40), 85 (11), 81 (17), 75 (13), 69 (11), 63 (13), 57 (14), 55 (24), 45 (26), 43 (24), 41 (17), 39 (15); HRMS (EI) m/z 344.0558 (M + , calcd for C17H13N2ClO4 344.0564). Anal.…”