I would like to have a vertical line before the last column, despite I used this symbol "vertical line" it does not appear, why?

```
  \begin{document}
\begin{table}
  \centering
%  \setlength{\tabcolsep}{.14cm} % Abstand zwischen den Spalten einer Tabelle
  \caption{babalaba.}
   \begin{tabular}{ccclc}
\toprule
 {L1}&{Linkers}&{L3}&{Dyes} \\
   \hline 
    RNA1 & \multirow{2}{*}[-0.72ex]{cL}& {D dye}\\
   \\[-1em]
 blabla & & {D dye}\\
%\bottomrule
\hline 
\end{tabular}
\label{table1}
\end{table}
\end{document}

```

![https://i.stack.imgur.com/CUukj.png](https://i.stack.imgur.com/CUukj.png)

Indeed I used the letter l instead of |

```
\begin{document}
\begin{table}
  \centering
%\setlength{\tabcolsep}{.14cm} % Abstand zwischen den Spalten einer 
Tabelle
  \caption{babalaba.}
\begin{tabular}{ccc|c}
\toprule
{L1}&{Linkers}&{L3}&{Dyes} \\
\hline 
 RNA1 & \multirow{2}{*}[-0.72ex]{cL}&{D dye}\\
 \\[-1em]
 blabla & & {D dye}\\
%\bottomrule
\hline 
\end{tabular}
\label{table1}
\end{table}
 \end{document}

```

However now I have a discontinuous vertical line:[![enter image description here](https://i.stack.imgur.com/TAqxO.png)](https://i.stack.imgur.com/TAqxO.png)