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1H NMR (400 MHz, CDCl3) δ 9.23 (s, 1H), 8.93 (s, 2H), 7.56 (s, 1H), 7.45 (s, 3H). 13C NMR (101 MHz, CDCl3) δ 157.94, 154.89, 136.08, 135.47, 133.18, 130.72, 129.12, 127.13, 125.18.