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Search Engine by Atom Number (e.g. CxHyOz)This is the easiest way

Search Engine by NameNote that a compound could have different names, the name you are looking for may not be the one used in the current data base, please send your comment in order to help us to add this name in the database.

Search Engine by InChIhttp://www.iupac.org/inchi/
InChI/Smiles Converter

Search Engine by CAS Numberhttp://www.cas.org/expertise/cascontent/registry/regsys.html

Search Engine by Smileshttp://www.daylight.com/dayhtml/doc/theory/theory.smiles.html
Draw the structure and get the Smiles

Search Engine by Family

Search Engine by Functional Group

Search Engine by Author

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