Provide the reactant(s)necessary to prepare the following compound. 
Definitions:
External Symptoms
Observable signs or indications of a disease or condition that manifest outside the body.
Cognitive Changes
Alterations in cognitive function that can occur through life due to factors such as aging, learning, or neurological conditions.
Self-Focused Thinking
A cognitive process where an individual's thoughts center on themselves, particularly on one's own feelings, behaviors, and attributes.
Negative Outcomes
Unfavorable or harmful results arising from actions, processes, or situations.
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