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The help for Isotope Pattern calculator v2.0

Calculating the molecular weight, molecular mass and isotope pattern. The punctuations are not supported except "(",")","." and "-". One "-" indicates to minus one H2O from molecular formula. In that case, "-" can be showed in anywhere in the molecular formula. The following examples are correct.

 Note:  [13C] presents 13C(isotope); [19F] presents 19F(isotope)