Question: 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

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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