def _get_database_name(id):
    """
    Get the correct UniProt database from the ID of the file to be downloaded.

    Parameters
    ----------
    id: str
        ID of the file to be downloaded.

    Returns
    -------
    name : str
        E-utility UniProt database name.
    """
    if id[:3] == "UPI":
        return "uniparc"
    elif id[:6] == "UniRef":
        return "uniref"
    return "uniprot"