In principle, the Diels-Alder reaction between 3 and 4 can produce two different products 5 and 6. In reality, only one of these two products is formed. Predict its structure.
(Note: To answer this question, you should evaluate the effects of the MeO and COMe groups on the relative polarization (δ+, δ- ) of all carbons that participate in this cycloaddition and consider that the δ+ carbons react preferably with the δ-).
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