def get_unique_smiles(smiles):
    """Given a list of smiles, return a list consisting of unique elements in it.

    Parameters
    ----------
    smiles : list of str
        Molecules in SMILES

    Returns
    -------
    list of str
        Sublist where each SMIES occurs exactly once
    """
    unique_set = set()
    for mol_s in smiles:
        if mol_s not in unique_set:
            unique_set.add(mol_s)

    return list(unique_set)