Which one of the following dienes is least stable? 
Definitions:
Psychotherapeutic Drugs
Medications used to treat mental health disorders by affecting chemical balances in the brain.
Cognitive Revolution
A significant shift in psychology during the 1950s-1960s, focusing on studying mental processes and structures.
Narcolepsy
A chronic sleep disorder marked by overwhelming daytime drowsiness and sudden attacks of sleep, often linked to a deficiency in the brain chemical orexin.
Voluntary Muscles
Muscles that can be consciously controlled by the brain to produce movements.
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