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1H NMR (400 MHz, CDCl3) δ 7.53 (d, J = 7.3 Hz, 4H), 7.45 – 7.32 (m, 8H), 7.01 (d, J = 8.5 Hz, 2H), 3.84 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 169.8, 159.0, 136.2, 130.0, 129.9, 128.6, 127.6, 124.4, 114.4, 55.5.