/// <summary>
        /// Build a version of the chemical formula which includes subscripting and converted chemical names
        /// </summary>
        /// <param name="Formula">The raw ASCII formula to parse</param>
        /// <returns>a unicode string representing the prettified formula</returns>
        private string _parseChemicalFormula(string Formula)
        {
            string FormattedFormula  = "";
            Regex  FormulaExpression = new Regex("(\\d*)([a-zA-Z\\d\\[\\]\\(\\)\\-^#=]+)([ .]*)(.*)");

            //borrow a dictionary of elements from structure search
            PeriodicTable PT = new PeriodicTable();


            while (false == string.IsNullOrEmpty(Formula))
            {
                GroupCollection FormulaGroups = FormulaExpression.Match(Formula).Groups;

                //append prefix numbers without changing them
                FormattedFormula = FormattedFormula + FormulaGroups[1];

                //iterate through the characters of the current compound from left to right
                char[] ChemicalCompound = FormulaGroups[2].ToString().ToCharArray();
                for (int i = 0; i < ChemicalCompound.Length; i++)
                {
                    char Letter = ChemicalCompound[i];

                    //convert numbers to subscript versions of themselves
                    if ('0' <= Letter && Letter <= '9')
                    {
                        ChemicalCompound[i] = (char)(Letter + 0x2050);
                    }

                    //determine the proper case for non-element letters
                    else if (false == PT.ElementExists(Letter.ToString()) && 'A' <= Letter && Letter <= 'Z')
                    {
                        char LastLetter = i > 0 ? ChemicalCompound[i - 1] : '\0';
                        char NextLetter = i < ChemicalCompound.Length - 1 ? ChemicalCompound[i + 1] : '\0';

                        //if the last letter plus this one lowercased make an element and the next is not already lowered
                        if (NextLetter != Char.ToLower(NextLetter) && PT.ElementExists("" + LastLetter + Char.ToLower(Letter)))
                        {
                            ChemicalCompound[i] = Char.ToLower(Letter);
                        }
                        //if this letter plus the next one lowercased make an element
                        else if (PT.ElementExists("" + Letter + Char.ToLower(NextLetter)))
                        {
                            ChemicalCompound[i + 1] = Char.ToLower(NextLetter);
                            i = i + 1;
                        }
                    } //else if( false == PT.ElementExists( Letter.ToString() ) && 'A' <= Letter && Letter <= 'Z' )
                }     //for( int i = 0; i < ChemicalCompound.Length; i++ )

                //append the prettified compound
                FormattedFormula = FormattedFormula + new string( ChemicalCompound );

                //append trailing characters, with periods converted to big middle dots
                FormattedFormula = FormattedFormula + FormulaGroups[3].ToString().Trim().Replace('.', (char)0x25cf);

                //move on to the next compoud in the formula
                Formula = FormulaGroups[4].ToString();
            }//while( false == string.IsNullOrEmpty( Formula ) )



            return(FormattedFormula);
        } //_parseChemicalFormula