@Test
public void testCyclic() throws Exception {

    SmilesParser sp = new SmilesParser(DefaultChemObjectBuilder.getInstance());
    IAtomContainer mol = sp.parseSmiles("C1CCC2CCCCC2C1");
    org.hamcrest.MatcherAssert.assertThat(((DoubleResult) descriptor.calculate(mol).getValue()).doubleValue(), closeTo(4.459, 0.001));
}