Which of the following cannot be the starting material for the following reaction? 
Definitions:
Constriction
The process of becoming narrower or tightening; in psychology, it can refer to a narrowing of thoughts or behaviors.
Replication
The process of repeating a research study or experiment to confirm its results.
Tay-Sachs Disease
A disorder that produces blindness and muscle degeneration prior to death; there is no treatment.
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