def isotope_parent(self, mol, skip_standardize=False):
if not skip_standardize:<EOL><INDENT>mol = self.standardize(mol)<EOL><DEDENT>else:<EOL><INDENT>mol = copy.deepcopy(mol)<EOL><DEDENT>for atom in mol.GetAtoms():<EOL><INDENT>atom.SetIsotope(<NUM_LIT:0>)<EOL><DEDENT>return mol<EOL>
Return the isotope parent of a given molecule.

        The isotope parent has all atoms replaced with the most abundant isotope for that element.

        :param mol: The input molecule.
        :type mol: rdkit.Chem.rdchem.Mol
        :param bool skip_standardize: Set to True if mol has already been standardized.
        :returns: The isotope parent molecule.
        :rtype: rdkit.Chem.rdchem.Mol