def fragment_parent(self, mol, skip_standardize=False):
if not skip_standardize:<EOL><INDENT>mol = self.standardize(mol)<EOL><DEDENT>fragment = self.largest_fragment(mol)<EOL>return fragment<EOL>
Return the fragment parent of a given molecule.

        The fragment parent is the largest organic covalent unit in the molecule.

        :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 fragment parent molecule.
        :rtype: rdkit.Chem.rdchem.Mol