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Terephthalic acid dimethyl ester (1a): 1H NMR (CDCl3): 3.95 (s, 6H, -OCH3), 8.10 (m, 4H, HAr); 13C NMR (CDCl3): 52.4 (-O-CH3), 129.5 (CH Ar), 133.9 (C Ar), 166.2 (C=O)
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