ChemDraw MCP (unofficial) MCP server

chemdraw-mcp

<!-- mcp-name: io.github.jurimaxam-dotcom/chemdraw-mcp -->

Chat → chemical structure. An MCP server for Claude Desktop: you describe a molecule, a reaction or a lab result in plain words, and it draws the figure — a print-ready PNG/SVG rendered locally with RDKit, plus an interactive preview inside the chat. "Draw aspirin" is already a complete command.

Built for pharmacy and chemistry students who spend too much time clicking hexagons: structures, reaction schemes, curved-arrow mechanisms and substrate-scope figures — the drawing a report or a slide actually asks for.

For the same lab report, also:

What it costs you: one install command. Apache-2.0, no API key, no sign-up for the server, no ChemDraw licence — you need Claude Desktop and uv, everything else is fetched once. Rendering runs entirely on your machine; only name resolution and the database lookups reach the internet. ChemDraw CDXML is an optional extra format for people who want to keep editing there, never a requirement.

Example output

"Draw caffeine" — print-ready PNG, generated by generate_molecule:

"Show the Fischer esterification of ethanol with acetic acid" — generate_reaction renders the scheme with conditions above the arrow, live in the chat panel:

"Show the Fischer esterification mechanism step by step" — generate_mechanism renders curved electron-flow arrows in the interactive panel:

"Make a scope figure of my Suzuki couplings: 3a 92%, 3b 88% after 12 h, 3c 64% with ee 94% and dr 10:1, 3d 71%" — generatescopetable sets the general equation with its conditions on top and the products below it, on a shared bond length and a shared caption baseline:

"Sketch the IR spectrum of ethyl acetate" — generate_spectrum (draws the peaks it is given, with per-type axis conventions):

Shortened. The full README is on GitHub.