What diene and dienophile would react to give the product below? 
Definitions:
Supply
The total quantity of a product or service that is available for purchase at a given price and time.
Elastic Supply
A situation where the quantity supplied of a good or service changes significantly when its price changes.
Normal Good
A good that has a positive income elasticity, so that as consumer income rises, demand for the good rises, too.
Market Supply
The total quantity of a good or service that sellers are willing and able to sell at a given price over a specific period.
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