Which of the following compounds is the least reactive dienophile in a Diels-Alder reaction? 
Definitions:
Proto-Oncogene
Gene that, by mutation, can become an oncogene.
Malignant Neoplasm
A cancerous tumor that is invasive and can spread to other parts of the body.
Tumor Cell
A cell that has undergone mutation leading to uncontrolled growth, potentially forming a tumor.
Telomere
A region of repetitive nucleotide sequences at the end of a chromosome, protecting it from deterioration or fusion with neighboring chromosomes.
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