                             <span class="stringliteral">&#39;OX&#39;</span>,  <span class="comment"># bound oxygen</span></div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;                                              <span class="stringliteral">&#39;PS5&#39;</span>,  <span class="comment"># pentasulfide-sulfur</span></div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;                                              <span class="stringliteral">&