Chemically Labeled Metabolite Database (CLMD) is a freely available database of chemically labeled metabolites based on LC-MS. This database consists of two kinds of data: 1) labeled authentic metabolites with standard, 2) labeled putative metabolites of from biospecimen without standard. Each chemically labeled metabolite entry contains Retention Index (RI) and MSn information (including accurate m/z, MS2 and MS3 spectra), etc, which is intended to be used for the identification annotation of chemically labeled metabolites.
Currently, this database consists of 2524 metabolites entries, including 870 from labeled authentic standards and 1654 from putative metabolites without standards. Based on the metabolite varieties, there are 12 derivatization reagents used to establish the database. CLMD supports searching by name, formula, RI, monoisotopic mass, m/z and other identifiers. This database is updated in real time, and more available metabolites will be added to expand the database.