What diene and dienophile would react to give the product below? 
Definitions:
Fatigue
A subjective feeling of tiredness which is distinct from weakness, and has a gradual onset.
Anxiety
A feeling of worry, nervousness, or unease, often about an imminent event or something with an uncertain outcome.
Depression
A common and serious mood disorder that negatively affects how you feel, think, and handle daily activities, often characterized by persistent feelings of sadness and loss of interest.
Future Loss
The potential for an individual or entity to experience a decrease in value or benefit in the future.
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