def read_atom_file(file):
    """Read file with atoms label

    Args:
        file (str): Name of file with atoms labels

    Returns:
        list: atoms labeled as <Residue Name> <Atom Name>
    """
    atoms = [line.rstrip('\n').split() for line in open(file, "r")]
    atoms = [[a[0] + " " + aa for aa in a[1::]] for a in atoms]

    return atoms