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        <dcterms:description xml:lang="en">Molecular modification is chemical alteration of a known and previously characterized lead compound for the purpose of enhancing its usefulness as a drug. This could mean enhancing its specificity for a particular body target site, increasing its potency, improving its rate and extent of absorption, modifying to advantage its time course in the body, reducing its toxicity, changing its physical or chemical properties (like solubility) to provide desired features.</dcterms:description>
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