Ingestion of mercury, which is poisonous, often is treated using chelation therapy. One agent used in this therapy is dimercaprol, which is shown below. Identify the features in the structure of this molecule that make it an effective chelation agent. 
Definitions:
Access to Medications
The availability or ability to obtain prescribed drugs for treatment or health maintenance.
Self-help Group
A support group composed of individuals with similar issues or conditions who gather to share experiences, offer encouragement, and help each other.
Suicide Precautions
Measures taken to prevent a person from acting on suicidal thoughts.
Lethality of Suicide Plan
An assessment of the potential danger or effectiveness of a suicide plan in causing death.
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