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webbook.nist.gov/chemistry/form-ser

Search for Species Data by Chemical Formula. Please follow the steps below to conduct your search (Help): Enter the desired chemical formula (e.g., C4H*Cl):

www.endmemo.com/chem/chemsearch.php

Chemical Compounds Lookup by Name or Formula.

pubchem.ncbi.nlm.nih.gov/search/search.cgi

PubChem Structure Search. ... Search By: Name/ Text, Identity/ Similarity, Substructure/ Superstructure, Molecular Formula, 3D Conformer, Saved Search ...

www.organic-chemistry.org/chemicals/search.htm

Organic Chemistry Portal · Chemicals >> Quick Search, Structure Search. Chemical Search Engine. Enter a name, molecular formula or cas number: ...

www.chemspider.com/StructureSearch.aspx

Search by Structure or Substructure. Upload a structure file or draw using a molecule editor.

www.chemspider.com

ChemSpider is a free chemical structure database providing fast access to over 34 million structures, properties and associated information.

www.chemspider.com/Search.aspx

Search by Systematic name, Synonym, Trade name, Registry number, SMILES or InChI.

www.sigmaaldrich.com/catalog/search/substructure/SubstructureSearchPage

Search Type. Substructure, Identity. Exact, Fragment. Similarity %. Search Options. Stereo. Tautomer. Total Hits. 50, 100, 200, 300, 500. Help. Clear. Search  ...

en.wikibooks.org/wiki/Chemical_Information_Sources/Chemical_Name_and_Formula_Searches

Although many resources have a molecular formula search option, molecular formulas are far from unique, retrieving anywhere from a few to thousands of ...