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1H NMR (400 MHz, DMSO-d6) ¦Ä 8.45 (s, 0H), 7.95 (d, J = 4.1 Hz, 0H), 7.81 (d, J = 7.7 Hz, 0H), 7.78 ¨C 7.54 (m, 1H), 7.52 ¨C 7.44 (m, 0H), 7.31 (dt, J = 18.3, 7.2 Hz, 0H), 7.19 (d, J = 7.8 Hz, 0H).
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