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  • Yellow crystal (76.2% yield); m.p.: 166-168 °C (lit. [61] 177-178 °C); UV-Vis (MeOH) λ: 359 nm; IR (KBr, cm): 3435 (O-H), 2945-2994 (Ar C-H stretch), 1623 (C=O), 1419-1590 (C=C), 1220-1221 (C-O); H-NMR (600 MHz, CDCl) δ: 14.19 (s, 1H, OH, C-2′), 8.12 (d, 1H, H-β, J = 15.70 Hz), 8.01 (d, 1H, H-α, J = 15.70 Hz), 7.78 (brs, 1H, H-6), 7.39 (d, 1H, H-4, J = 8.70 Hz), 6.97 (d, 1H, H-3, J = 8.64 Hz), 6.13 (brs, 1H, H-3′), 6.12 (brs, 1H, H-5′), 3.98 (s, 3H, OCH, C-6′), 3.88 (s, 3H, OCH, C-4′); EI-MS: m/z = 379 (1), 364 (14), 333 (5), 305 (3), 281 (9), 251 (3), 227 (9), 214 (17), 207 (60), 191 (10), 142 (13), 115 (8), 95 (10), 73 (14); (Molecular formula CHBrO). (E)-3-(2-Bromo-3-hydroxy-4-methoxyphenyl)-1-(2′-hydroxy-4′,6′-dimethoxyphenyl)prop-2-en-1-one (23).
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