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1H NMR (400 MHz, DMSO-d6) ¦Ä 9.61 (s, 1H), 9.15 (s, 1H), 7.45 (d, J = 15.9 Hz, 1H), 7.34 ¨C 7.25 (m, 4H), 7.22 (ddd, J = 5.7, 4.2, 1.9 Hz, 1H), 7.04 (d, J = 2.0 Hz, 1H), 6.99 (dd, J = 8.2, 2.0 Hz, 1H), 6.76 (d, J = 8.1 Hz, 1H), 6.23 (d, J = 15.9 Hz, 1H), 4.31 (t, J = 6.9 Hz, 2H), 2.94 (t, J = 6.9 Hz, 2H).

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