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1H NMR (500 MHz, DMSO-d6) 8.41 (d, J = 7.2 Hz, 1H), 7.81 (dd, J1 = J2 = 6.8 Hz, 2H), 7.46 (dd, J1 = J2 = 7.6 Hz, 1H), 6.70 (d, J = 7.6 Hz, 1H), 4.28 (t, J = 6.8 Hz, 2H), 2.22-2.29 (m, 2H), 2.01-2.06 (m, 2H), 1.63-1.69 (m, 2H) ppm.
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