Provide the final products expected from the Diels–Alder reaction given below.

Final product of Diels-Alder reaction with two aldehyde groups.

Final product of Diels-Alder reaction with two aldehyde groups, different orientation.

Final product of Diels-Alder reaction with two aldehyde groups, another orientation.

Final product of Diels-Alder reaction with two aldehyde groups, yet another orientation.