addMolecules            Add/subtract sum formulas
decomposeIsotopes       Mass Decomposition of Isotope Patterns
getMolecule             Calculate mass and isotope information for a
                        molecule given as sum formula
initializeElements      Initialize (a subset of) elements of the
                        periodic system of elements (PSE)
isotopes                isotope information.
mono_masses             Monoisotopic mass information..
