What is the missing reactant in the following reaction? 
Definitions:
Epicurus
An ancient Greek philosopher who founded Epicureanism, a philosophy that sought to find the greatest happiness through the pursuit of modest pleasures and the freedom from fear and pain.
Human Existence
The state or fact of living or having objective reality, typically considered within the context of what it means to be human.
Tranquil Mind
A state of mental calm and clarity, free from agitation, stress, or anxiety.
Unlimited Pleasure
The concept of seeking pleasure without any constraints or consideration of possible negative consequences.
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