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1H NMR (500 MHz, Chloroform ) ¦Ä 6.89 (s, 1H), 6.85 (s, 1H), 6.71 (d, J = 30.0 Hz, 2H), 6.06 (s, 2H), 4.52 (s, 2H), 4.41 (s, 1H), 3.82 (s, 3H), 3.66 (d, J = 15.5 Hz, 5H), 3.25 (s, 1H), 3.18 (s, 1H), 3.10 (s, 3H), 3.01 (s, 2H).

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