How to create a Molecule from SelectionMolecule?

I have an original molecule and I cretate a SelectionMolecule from one part of it.

I want to use that selected part as a new molecule and export it.

Here is the code:

   public static void main(String[] args) throws IOException {

	// my original molecule

	Molecule originalMolecule = MolImporter.importMol("CCCCC(OCC(=O)O)CCCCCC");

	

	// add all atoms around atom 4 in depth 2 into selection

	MolAtom a4 = originalMolecule.getAtom(4);

	int depth = 2;

	SelectionMolecule selection = new SelectionMolecule();

	selection.add(a4);

	addToSelection(a4, selection, depth);

	

	// finally I fuse my selection into a new molecule so I can export it

	Molecule molFromSelection = new Molecule();

	molFromSelection.fuse(selection);

	System.out.println(MolExporter.exportToFormat(molFromSelection, "smiles"));

    }



    /**

     * Add all atoms around the given atom until given depth to selection.

     * 

     * @param a atom to start from

     * @param selectionMol 

     * @param depth

     */

    private static void addToSelection(MolAtom a, SelectionMolecule selectionMol,

	    int depth) {

	if (depth == 0)

	    return;

	for (int i = 0; i < a.getBondCount(); i++) {

	    MolBond b = a.getBond(i);

	    if (!selectionMol.contains(b)) {

		MolAtom atom = a.getLigand(i);

		selectionMol.add(atom);

		selectionMol.add(b);

		addToSelection(atom, selectionMol, depth-1);

	    }

	}

    }