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<a accesskey="1" href="page.php?w=substructure_search&amp;p=2">1.Previous</a><br />
<a accesskey="3" href="page.php?w=substructure_search&amp;p=4">3.Next</a>
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<p>chemical drawing software. Large publicly available databases like <a href="page.php?w=PubChem">PubChem</a> and <a href="page.php?w=ChemSpider">ChemSpider</a> can be searched this way, as can <a href="page.php?w=Wikipedia">Wikipedia</a>'s articles describing individual chemicals.</p>

<p><big>Definitions</big></p>
<p>Substructure search is used to retrieve from a <a href="page.php?w=chemical_database">database of chemicals</a> those which contain the pattern of atoms and bonds specified by a user. It is implemented using a specialist type of <a href="page.php?w=query_language">query language</a></p><p>
<a accesskey="1" href="page.php?w=substructure_search&amp;p=2">1.Previous</a><br />
<a accesskey="3" href="page.php?w=substructure_search&amp;p=4">3.Next</a>
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