mcp-molecules
An MCP server for chemistry: it computes molecular weights and isotope distributions from chemical formulae and resolves compound name/formula lookups, backed by NIST atomic-weight data and a cached finder over multiple online and offline sources.
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Install
uvx mcp-molecules
Paste the configuration above into your MCP client config (claude_desktop_config.json for Claude Desktop) and restart the client.
{
"mcpServers": {
"mcp-molecules": {
"command": "uvx",
"args": [
"mcp-molecules"
],
"env": {
"MCP_MOLECULES_ONLINE": "<MCP_MOLECULES_ONLINE>",
"MCP_MOLECULES_EPA_API_KEY": "<MCP_MOLECULES_EPA_API_KEY>"
}
}
}
}Paste the configuration above into your MCP client config (claude_desktop_config.json for Claude Desktop) and restart the client.
Sources: public MCP Server directories. This is an independent third-party directory with no affiliation to or endorsement from the maintainers of the listed servers.
