Which of the following pairs of compounds could be used as the basis for a Diels-Alder synthesis of the compound shown below? 
Definitions:
Adaptive Flexibility
The capacity of an organism to adjust its behaviour and physiology in response to changing environmental conditions.
Fitness
A state of health and well-being that is achieved through a combination of physical exercise, proper nutrition, and sufficient rest.
Reproduce
The biological process by which new organisms are generated from parent organisms.
Reproductive Potential
The possible reproductive capacity or output of an organism or population, often considering factors like age and health.
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