n class="stringliteral">&#39;GU2&#39;</span>,  <span class="comment"># 2,3-di-o-methyl-alpha-l-idopyranuronic acid</span></div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;                                              <span class="stringliteral">&#39;GU1&#39;</span>,  <span class="comment"># 2,3-di-o-methyl-beta-d-glucopyranuronic acid</span></div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;                                              <span