Converting HTML text into PDF using PdfStamper

i want to create a pdf using itextsharp in which chemical formula.

please give me an example of PdfStamper converting chemical formula <p>C₃₂H₁₆CuN₈</p> to C₃₂H₁₆CuN₈ 

 table = new PdfPTable(2);
            table.SetWidths(new float[] { 0.3f, 0.7f });
            table.TotalWidth = 500f;
            table.LockedWidth = true;
            table.SpacingBefore = 5f;

            StringWriter sw = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(sw);
            lblChemicalFormula.RenderControl(hw);
            StringReader sr = new StringReader(sw.ToString());
            HTMLWorker htmlparser = new HTMLWorker(document);
            htmlparser.Parse(sr);



            String pathin = "C:\\Users\\Admin\\Downloads\\Employee.pdf";
            String pathout = "C:\\Users\\Admin\\Downloads\\Employee.pdf";

            PdfReader reader = new PdfReader(pathin);

            PdfStamper stamper = new PdfStamper(reader, new FileStream(pathout, FileMode.Create));
            List list = new List(List.ORDERED);
            string text = "<p>C<sub>32</sub>H<sub>16</sub>CuN<sub>8</sub></p>";
            List<IElement> htmlarraylist = HTMLWorker.ParseToList(new StringReader(text), null);
            for (int k = 0; k < htmlarraylist.Count; k++)
            {
                list.Add((IElement)htmlarraylist[k]);
            }

            ColumnText ct = new ColumnText(stamper.GetOverContent(1));
            ct.AddElement(list);
            Rectangle rect = new Rectangle(46, 190, 530, 36);
            ct.SetSimpleColumn(rect);
            ct.Go();
            stamper.Close();



            table.AddCell(PhraseCell(new Phrase("Chemical Formula :", FontFactory.GetFont("Verdana", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
            table.AddCell(PhraseCell(new Phrase(lblChemicalFormula.Text, FontFactory.GetFont("Verdana", 8, Font.NORMAL | Font.UNDERLINE, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
            document.Add(table);