span>&#160;                                              <span class="stringliteral">&#39;CU&#39;</span>,  <span class="comment"># copper (ii) ion</span></div><div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;                                              <span class="stringliteral">&#39;MGF&#39;</span>,  <span class="comment"># trifluoromagnesate</span></div><div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;                                             