an class="fu"><a href="https://rdrr.io/r/base/library.html">require</a></span>(<span class="no">standartox</span>)
<span class="no">cas</span> <span class="kw">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html">c</a></span>(<span class="kw">Copper2Sulfate</span> <span class="kw">=</span> <span class="st">'7758-98-7'</span>,
        <span class="kw">Permethrin</span> <span class="kw">=</span> <span class="st">'52645-53-1'</span>,
        <span class="kw">Imidacloprid</span> <span class="kw">=<