I'm looking for large open data which provides chemical compounds, substances, structures and products. Database of chemical reactions, formulas and similar would be beneficial as well.
Some academia and industrial databases (not open data):
- The CambridgeSoft Available Chemicals Exchange (ChemACX) (6.8 million substances, 6.7 million structures and 10.4 million products)
- Instant JChem (millions of structures)
- CAS REGISTRY by CAS (89 million unique organic and inorganic chemical substances, very costly)
- Reaxys and Reaxys Medicinal Chemistry (a fully indexed and organized database of around 16,000 periodicals containing 500 million published experimental facts - very costly)