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Motivation: Identification of metabolites is essential for its use as biomarkers, for research in systems biology, and for drug discovery. The first step before a structure can be elucidated is to determine its elemental composition. High resolution mass spectrometry, which provides the exact mass, together with common constraint-rules, for rejecting false proposed elemental compositions, can not always provide one unique elemental composition solution. Results: The Multi-stage Elementaldoi:10.1093/bioinformatics/btr409 pmid:21757467 fatcat:htd5g3kfvvaelh4lbuuid456m4