How is the following amino acid categorized? The structure shows its form at pH = 7. 
Definitions:
Time Restriction
Limitations placed on the duration within which certain actions can be taken or functions performed.
Work Conditions
Aspects of a work environment and job that can affect employees' physical and mental wellbeing, including safety standards, hours, stress levels, and the physical workspace.
Secondary Boycott
An organized protest against a company's dealings with another company that is the direct target of a labor dispute.
Picket Lines
A boundary established by workers on strike, especially outside their place of employment, to protest labor conditions or policies.
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