@Test public void relativeStereoMolecule() {

    CxSmilesState state = new CxSmilesState();
    assertThat(CxSmilesParser.processCx("|r|", state), is(not(-1)));
    assertThat(CxSmilesParser.processCx("|r,$_R1$|", state), is(not(-1)));
    assertThat(CxSmilesParser.processCx("|$_R1$,r|", state), is(not(-1)));
}