def bookkeep_product(mol):
    """Bookkeep reaction-related information of atoms/bonds in products

    Parameters
    ----------
    mol : rdkit.Chem.rdchem.Mol
        RDKit molecule instance for products.

    Returns
    -------
    info : dict
        Reaction-related information of atoms/bonds in products
    """
    info = {
        'atoms': set()
    }
    for atom in mol.GetAtoms():
        info['atoms'].add(atom.GetAtomMapNum() - 1)

    return info