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1H NMR (400 MHz, CDCl3) δ 7.41-7.32 (m, 8H), 7.29-7.25 (m, 2H), 7.21-7.14 (m, 3H), 7.09 (dd, J = 7.6, 1.8 Hz, 2H), 7.03 (s, 1H); 13C{H} NMR (101 MHz, CDCl3) δ 143.4, 142.6, 140.3, 137.4, 130.4, 129.5, 128.6, 128.2, 128.1, 127.9, 127.6, 127.5, 127.4, 126.7。