node.addInput(<span class="stringliteral">&quot;molecule&quot;</span>, BSS.Gateway.File(help=<span class="stringliteral">&quot;A molecular input file, e.g. a PDB file.&quot;</span>))</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;node.addInput(<span class="stringliteral">&quot;forcefield&quot;</span>, BSS.Gateway.String(help=<span class="stringliteral">&quot;The name of the force field to use for parameterisation.&quot;</span>,</div><div class="line"><a name="l00017"></a>