def load_rdkit_mol(cls, mol, system_name='rdkit', mol_id=0):
        """
        Create a :class:`Molecule` from :class:`rdkit.Chem.rdchem.Mol`.

        To be used only by expert users.

        Parameters
        ----------
        mol : :class:`rdkit.Chem.rdchem.Mol`
           An RDKit molecule object.

        Returns
        -------
        :class:`pywindow.molecular.Molecule`
            :class:`Molecule`

        """
        return cls(Input().load_rdkit_mol(mol), system_name, mol_id)