🏳️PubChem

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Search and explore chemical information in the world's largest free chemistry database. 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.

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*   [aspirin](#query=aspirin)

*   [EGFR](#query=EGFR)

*   [C9H8O4](#query=C9H8O4)

*   [57-27-2](#query=57-27-2)

*   [C1=CC=C(C=C1)C=O](#query=C1%3DCC%3DC\(C%3DC1\)C%3DO)

*   [InChI=1S/C3H6O/c1-3(2)4/h1-2H3](#query=InChI%3D1S%2FC3H6O%2Fc1-3\(2\)4%2Fh1-2H3)

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[Browse Data](https://pubchem.ncbi.nlm.nih.gov/classification/)

[Periodic Table](/periodic-table/)

*   119MCompounds

*   328MSubstances

*   297MBioactivities

*   43MLiterature

*   51MPatents

[See More Statistics](https://pubchemdocs.ncbi.nlm.nih.gov/statistics)

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### What is PubChem?

PubChem is the world's largest collection of freely accessible chemical information. 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.

We are constantly adding new data and working on improving interfaces to chemical information. Please check back often!

[Learn More About PubChem](https://pubchemdocs.ncbi.nlm.nih.gov/about)