Metabolomics archive and reference database. Cross-species, cross-application, open-access, open-submission archive and reference database for metabolomics. Covers metabolite structures and their reference spectra as well as their biological roles, locations and concentrations, and experimental data from metabolic experiments.

Database of proteolytic enzymes, their substrates and inhibitors.

Integrated enzyme data from EMBL-EBI resources. Integrated functional, sequence, nomenclature, substrate, product and cofactor data for enzymes.

Curated database of enzyme-catalysed reactions.

Bioactive data for drug discovery. An open data resource of binding, functional and ADMET bioactivity data.

Dictionary of chemical components referred to in PDB entries and maintained by the wwPDB. Ligands, small molecules and monomers etc.

Resource for molecular entities, focused on ‘small’ chemical compounds. Reference chemical structures, nomenclature and ontological classification.