Systems and methods for the care of the mass spectra libraries. In general, provided that the systems and methods (a) a derived experimentally mass spectrum of a compound of interest; (b) identifying a peak in the mass spectrum, one of the experimental m / z - value (mass / charge - value) for a ions fragment of the compound; (c) from the mass spectrum any peak removal, which is not of interest corresponds to the connection; and (d) the experimental m / z - value for the in the case of step (b) identified peak as a function of the calculated theoretical m / z - value for the ions to fragment replace.
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