class DebugChemObjectBuilder implements IChemObjectBuilder {

    public static IChemObjectBuilder getInstance() {
        IChemObjectBuilder result = instance;
        if (result == null) {
            result = instance;
            synchronized (LOCK) {
                if (result == null) {
                    instance = result = new DebugChemObjectBuilder();
                }
            }
        }
        return result;
    }

    private  DebugChemObjectBuilder();

}