Commercial Libraries
- eMolecules: commercially-available compounds
- MCULE: Commercial compound collection (online)
- Molport: commercially-available compounds
- Zinc: a free database of commercially-available compounds
- ZINC Express: A Virtual Assistant for Purchasing Compounds Annotated in the ZINC Database (online)
- ZINC20: ZINC20—A Free Ultralarge-Scale Chemical Database for Ligand Discovery