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:
Starting Material
The raw substances or components that are used as the basis for a chemical reaction or manufacturing process.
Limestone
A sedimentary rock composed mainly of skeletal fragments of marine organisms such as coral, forams, and mollusks.
Gas Centrifuges
Devices used in the uranium enrichment process that rapidly spin gas to separate isotopes, particularly to increase the percentage of uranium-235 for use in nuclear reactors or weapons.
Uranium Isotope
Variants of the element uranium that contain the same number of protons but different numbers of neutrons in their nuclei, with different isotopes having different nuclear properties.
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