The unified CCS database is one of the most comprehensive CCS databases, covering ~1,700,000 small molecules. It collects 3,539 unified CCS values with well-defined confidence level, and ~10,000,000 predicted CCS values.


This part provides a machine-learning based CCS prediction function with the input of SMILES structures. The prediction error is estimated as low as ~2% (Median relative error), and users could predicted CCS values for novel structures.


The part provides an easy-to-use annotation function for various features or compounds. It is supported to search database with measured m/z and CCS for annotation, or in conjunct with any other annotation tools, such as MetFrag, CFM-ID, MS-Finder, and SIRIUS etc.

Database statistics

  • Statistics of database: 1,670,596 compounds and 11,697,711 CCS records
  • Statistics of experimental database: 2,193 compounds, 3,539 unified CCS and 5,119 CCS records


  • Cloud server online test (2019.11.08)
  • Demo webserver online (2019.09.22)


  1. Z. Zhou, Z.-J. Zhu* etc. Advancing CCS database towards metabolite annotation, In preparing

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