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1H NMR (500 MHz, CDCl3) 7.90 (d, J = 14.8 Hz, 1H), 6.89 (d, J = 14.8 Hz, 1H), 3.76 (s, 3H).

13C NMR (125 MHz, CDCl3) 164.6, 136.1, 99.7, 51.9.