The Metabolite and Tandem Mass Spectrometry Database (METLIN) is maintained by the Scripps Center for Metabolomics. This database contains an annotated list of known metabolites and their masses, chemical formulas, and structures. Each metabolite is linked to outside resources for further reference and inquiry. Tandem mass spectrometry data is also available on many of the metabolites. The database is expanding continuously as more metabolite information is discovered and deposited.
Public access to METLIN's information is provided in order to facilitate metabolomics experiments. Programmatic access is provided using a SOAP-based API.