                            <span class="stringliteral">&#39;NDG&#39;</span>,  <span class="comment"># 2-(acetylamino)-2-deoxy-a-d-glucopyranose</span></div><div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;                                              <span class="stringliteral">&#39;XE&#39;</span>,  <span class="comment"># xenon</span></div><div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;                                              <span class="st