PubChem contains the chemical structures of small organic molecules and information on their biological activities. It is organized as three linked databases: PubChem Substance, PubChem Compound, and PubChem BioAssay.
PubMed comprises more than 23 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
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