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The different sections available in ChirBase
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Exact Structure Search
A Molecule Exact Structure search finds records that match your molecule query exactly.
Do not specify the stereochemistry of your sample in order to find all the possible isomers
A Molecule Substructure (SSS) search finds molecule records that contain your query as a substructure wholly within a larger structure. Your substructure query is a two-dimensional representation of a portion of a molecule (a 2D substructure).
For many classes of compounds, the generic structure can not be directly used as a SSS query.
You must add additional query features to ensure that you retrieve exactly the class of compounds that you want.
Molecule Similarity search finds records in your remote database that are structurally similar to your structure query. You can define the degree of similarity in your query to be an arbitrary value between 0 and 100 (these are not actual units). The higher the value, the more similarity.