What is the nucleophilic species involved in the initial step of the reaction below? 
Definitions:
Prefrontal Cortex
The front part of the frontal lobes of the brain, involved in complex behaviors including planning, decision making, and moderating social behavior.
Conditioned Stimulus
A previously neutral stimulus that, after being associated with an unconditioned stimulus, eventually triggers a conditioned response.
Unconditioned Response
An automatic, natural reaction to a stimulus that occurs without any need for learning or previous experience.
Turbulent Conditions
Situations characterized by disorder, instability, or rapid changes that can create challenges or uncertainty.
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