ChemCrow
Couples an LLM planner with 18 deterministic cheminformatics, retrosynthesis, and safety verification tools.
The loop
- Proposes
An LLM proposes multi-step synthesis plans, SMILES structures, and reaction queries.
- Judged by
Deterministic RDKit validators, RXN4Chemistry retrosynthesis engines, and controlled-substance safety checkers verify chemical validity and feasibility.
- Steers
Tool outputs return to the model at each step; the validation of the robotic platform is iterated until the procedure is valid.
Headline result
Autonomously planned and executed wet-lab syntheses of an insect repellent, three organocatalysts, and a novel chromophore.
What this does not prove
Synthesis success remains bounded by the coverage of the underlying retrosynthesis templates and reagent inventory.
How it generalizes the harness
A controlled-chemical check and an explosive check screen a requested molecule before synthesis planning or execution; robotic synthesis executes routes, it does not verify them.
Classification
| What it proposes | Molecule |
|---|---|
| Generative model | GPT-4 chemical synthesis planner |
| Algorithmic authority | RDKit, RXN4Chemistry retrosynthesis engine, and robotic wet-lab execution |
| Feedback | Verifier errors |
| What gets updated | Prompt context |
| When it runs | At inference time |
| Validity | Approximate physics (simulation, not lab results) |
| Evidence | Experiments reported |
| Lineage | Original system |