@Test
public void indole() throws Exception {

    String smarts = generate("[nH]1ccc2c1cccc2",
                             SmartsFragmentExtractor.MODE_EXACT,
                             makeSeq(0,4));
    assertThat(smarts, is("[nH1v3X3+0][cH1v4X3+0][cH1v4X3+0][cH0v4X3+0]"));
}