After the compound shown was heated in D2O containing K2CO3 at 70C the only signals that could be found in its 1H NMR spectrum were

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After the compound shown was heated in D2O containing K2CO3 at 70°C the only signals that could be found in its 1H NMR spectrum were at δ3.9 ppm (6H) and 6.7–6.9 ppm (3H). What happened?

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