def smiles_from_folder_name(url_encoded_smiles):
    """
    Returns the URL encoded SMILES containing special characters as regular SMILES.

    Parameters
    ----------
    url_encoded_smiles : str
        A SMILES containing standard URL encoding symbols, such as %2F.

    Returns
    -------
    str :
        The SMILES with special characters as such.
    : <- %3A
    \\ <- %5C (here backslash)
    / <- %2F
    * <- %2A

    Notes
    -----
    https://www.degraeve.com/reference/urlencoding.php
    """
    smiles = (
        url_encoded_smiles.replace("%3A", ":")
        .replace("%5C", "\\")
        .replace("%2F", "/")
        .replace("%2A", "*")
    )
    return smiles