ingliteral">&#39;SGM&#39;</span>,  <span class="comment"># monothioglycerol</span></div><div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;                                              <span class="stringliteral">&#39;DTU&#39;</span>,  <span class="comment"># (2r,3s)-1,4-dimercaptobutane-2,3-diol</span></div><div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;                                              <span class="stringliteral">&#39;MOO&#39;</span>,  