The world largest open collection of chemical information.

You can search it by substance (for example, active subtance of a drug product) or by target molecules.

Each substance page includes structured information:

• All accepted names, excluding trade names,
• Physical appearance and properties,
• Common applications,
• Molecular formula and structure (visualized),
• Standard identifiers (such as CAS No.),
• Chromatograms, spectra, etc.
• Relevant references, incl. links to other online resources,
• And more.

All entries are interlinked, so you can switch from the active substance description to the description of its target, and so on.

This database is a great place to double-check chemical and physical properties of substances.