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Please pay attention to the location of COOCH2CH3 substituent of the product. It has shift to the left by one carbon.O= NaOET O O OUse intramolecular aldol reaction & a retro aldol-like reaction to get the expected product.

Please pay attention to the location of COOCH2CH3 substituent of the product. It has shift to the left by one carbon.

Please pay attention to the location of COOCH2CH3 substituent of the product. It has shift to the left by one carbon.

Show the arrow mechanism to solve the problem

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