 <span class="stringliteral">&#39;CTP&#39;</span>,  <span class="comment"># cytidine-5&#39;-triphosphate</span></div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;                                              <span class="stringliteral">&#39;ACE&#39;</span>,  <span class="comment"># acetyl group</span></div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;                                              <span class="stringliteral">&#39;3OF&#39;</span