1604 (NH2), 1580 (C = N imine), 1508 and 1451 (C = C), 1255 (C-O), 1169 (C-N). 1H NMR. (600 MHz, DMSO-d6) δ: 10.02 (s, 1H), 9.73 (s, 1H), ...
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