Identify the nucleophilic atom in the following molecule. 
Definitions:
Repolarization
The process of restoring the resting negative charge inside a cell membrane after depolarization, crucial for the function of nerve and muscle cells.
Nervous System
The complex network of nerve cells and fibers that transmits nerve impulses between parts of the body, comprising the central and peripheral nervous systems.
Endocrine System
A network of glands and organs that produce, store, and secrete hormones into the bloodstream to regulate the body’s growth, metabolism, and function.
Neuromodulators
Chemicals released by nerve cells to signal, modify, and regulate the activity of other neurons.
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