title: remove single back slash from string using R
body: <p>I have string </p>
  
  <pre><code>a &lt;- c("COC1=CC(\\C=C\\C(=O)CC(=O)\\C=C\\C2=CC=C(O)C(OC)=C2)=CC=C1O")
  </code></pre>
  
  <p>I want to remove single backslash. I am expecting following result</p>
  
  <pre><code>COC1=CC(\C=C\C(=O)CC(=O)\C=C\C2=CC=C(O)C(OC)=C2)=CC=C1O
  </code></pre>