Which of the following compounds is the least reactive dienophile in a Diels-Alder reaction? 
Definitions:
Heart Attack
A medical emergency characterized by the sudden blockage of blood flow to the heart muscle, often resulting in chest pain and potentially fatal if not treated promptly.
Impatient
The feeling of irritation or distress over having to wait, often leading to a desire for immediate action or results.
Commuting
The process of traveling between one's home and place of work or study.
Stressor
An event, situation, or other stimulus that causes stress.
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