span>,  <span class="comment"># dioxane</span></div><div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;                                              <span class="stringliteral">&#39;COB&#39;</span>,  <span class="comment"># co-methylcobalamin</span></div><div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;                                              <span class="stringliteral">&#39;B12&#39;</span>,  <span class="comment"># cobalamin</span></div><div clas