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Only one (cis) isomer of product is formed in the Diels-Alder cycloaddition. Explain why one product...

Only one (cis) isomer of product is formed in the Diels-Alder cycloaddition. Explain why one product is formed, and why is has that particular stereochemistry ( the Diels-Alder cycloaddition in this case is butadiene reacting with maleic anhydride)

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