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io.github.cyanheads/pubchem-mcp-server
An MCP (Model Context Protocol) server providing comprehensive access to PubChem's vast chemical information database. Enables LLMs and AI agents to search, retrieve, and analyze chemical compounds, substances, and bioassays through the PubChem PUG REST API.
Get a compound's bioactivity profile: which assays tested it, activity outcomes (Active/Inactive/Inconclusive), target identifiers (NCBI Gene ID, UniProt/GenBank accession), and quantitative values (IC50, EC50, Ki, etc.). Filter by outcome and/or a specific molecular target (NCBI Gene ID or protein accession) to focus the profile — e.g. "is this compound active against target T?".
Get a compound's default 3D conformer — atomic coordinates and bonds — for one CID. format="json" (default) returns parsed atoms and bonds the model can reason over directly; format="sdf" returns the raw V2000 SDF text for passthrough to docking, rendering, or conformer tools. Optionally lists alternate conformer IDs. Not every compound has computed 3D coordinates (large molecules, mixtures, and some salts do not).
Get detailed compound information by CID. Returns physicochemical properties (molecular weight, SMILES, InChIKey, XLogP, TPSA, etc.), optionally with a textual description (pharmacology, mechanism, therapeutic use), all known synonyms, drug-likeness assessment (Lipinski/Veber rules), and/or pharmacological classification (FDA classes, MeSH classes, ATC codes). Efficiently batches up to 100 CIDs.
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UniProt Consortium