class IsotopeContainer {

    public IMolecularFormula getFormula() {
        return forms.isEmpty() ? null : forms.get(0);
    }

    public  IsotopeContainer();
    public  IsotopeContainer(IMolecularFormula formula, double intensity);
    public  IsotopeContainer(double mass, double intensity);
    public  IsotopeContainer(IsotopeContainer container);

}