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2. PubChem

   pubchem.ncbi.nlm.nih.gov

   Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

3. Chemical Structure Search - Fisher Sci

   www.fishersci.com/us/en/search/chemical/substructure.html

   Use this chemical structure search tool to search our chemical database for an exact or substructure match on your molecule of interest. You can also use this chemical structure tool to draw and modify standard organic chemical and organometallic structures.

4. ChemSpider: Search and Share Chemistry - Homepage

   www.chemspider.com

   Search ChemSpider. Matches any text strings used to describe a molecule. Search help. Filter. Our sponsors. A free chemical structure database providing fast text and structure search access to over 130 million structures from hundreds of data sources.

5. Structure Search - ChemSpider

   www.chemspider.com/StructureSearch.aspx

   This is the new ChemSpider site, some advanced search features are still to be released. The legacy Chemspider site is still available for the time being. Structure search This page is currently under development! We are constantly updating ChemSpider and adding new features. In the meantime you can still access the functionality on the legacy ...

6. Chemical Name Calculator

   www.omnicalculator.com/chemistry/chemical-name

   Are you having trouble with finding the name of your ionic compound? Our chemical name calculator can help you with that!

7. Search for Species Data by Chemical Name - NIST Chemistry WebBook

   webbook.nist.gov/chemistry/name-ser

   Search for Species Data by Chemical Name Please follow the steps below to conduct your search (Help) : Enter a chemical species name or pattern: (e.g., methane, *2-hexene)

8. IUPAC Identifier Search - NIST Chemistry WebBook

   webbook.nist.gov/chemistry/inchi-ser

   Search for Species Data by IUPAC International Identifier. This form allows searching on IUPAC International Chemical Identifiers (InChI) and standard InChI hashes (InChIKey).

9. The PubChem Compound Help

   pubchem.ncbi.nlm.nih.gov/search/help_search.html

   There are various indexes that can be individually searched by suffixing the text phrase or keyword with an appropriate index and by using brackets (for example, to search a particular IUPAC name: "4-(diaminomethylideneamino)butanamide"[iupacname]).

10. Structure Search - PubChem

    pubchem.ncbi.nlm.nih.gov/docs/structure-search

    PubChem Structure Search allows the PubChem Compound Database to be queried by chemical structure or chemical structure pattern.

11. IUPAC Naming

    www.iupacnaming.com

    A definition of IUPAC naming for molecular structures and free online IUPAC naming.