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Use PubChem with your AI.

Connect your account once and let the AI you already use work with it, without building another integration. Search 116M+ chemical compounds with molecular properties, SMILES notation, formulas, and drug-like properties from the world's largest free chemistry database.

Included with plan

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

ChatGPTClaudeCursorPerplexityGeminiMicrosoft CopilotRaycastMeta AI

Complete set · 3 capabilities

The complete PubChem capability set.

These are the exact actions your AI can choose when you ask it to work with PubChem.

Capability set01 / 01

01-03

3 capabilities in this set.

Part of 3 available through PubChem.

  1. 01

    Get pubchem compound

    Get full chemical data for a PubChem compound by CID

  2. 02

    Search pubchem

    Returns molecular formula, weight, SMILES, InChI, XLogP, hydrogen bond donors/acceptors, and complexity. Try: aspirin, caffeine, glucose, penicillin, dopamine. Search PubChem for chemical compounds by name

  3. 03

    Search pubchem formula

    G. C9H8O4, C8H10N4O2, H2O) and find matching compounds. Find compounds by molecular formula

Observed, not estimated

891ms average. Fast in production.

PubChem is checked daily against the live service.

Daily averagePeak 1057ms
Aug 20Today
Fastest day
690ms
Slowest day
1057ms
14-day trend
Slowing+7%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 3 capabilities arrive ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of PubChem, so you can see the experience inside your AI.

It does not authenticate your account with PubChem. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

PubChem Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_bfnYDABzlJ07TJu7Do9K5lCyve4Fg9F5YGb6KetY/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — PubChem capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "pubchem-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_bfnYDABzlJ07TJu7Do9K5lCyve4Fg9F5YGb6KetY/mcp"
    }
  }
}
  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Step-by-step instructions for each client are in the guide. How to connect

FAQ

Questions PubChem owners ask.

  • 01

    Do I need an API key to use PubChem?

    No. PubChem PUG REST is completely free and open without any authentication. The only limitation is a rate limit of 5 requests per second and 400 requests per minute, which is more than sufficient for conversational AI usage.

  • 02

    What molecular properties are returned for each compound?

    Each compound includes: CID, IUPAC name, molecular formula, molecular weight, canonical SMILES, InChI identifier, XLogP (lipophilicity), hydrogen bond donor count, hydrogen bond acceptor count, and molecular complexity score. These cover Lipinski's Rule of Five for drug-likeness assessment.

  • 03

    Can I search by molecular formula instead of name?

    Yes! Use the formula search capability with standard notation (e.g., C8H10N4O2 for caffeine, C9H8O4 for aspirin, H2O for water). PubChem will return all compounds matching that exact formula with their names and properties.

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