@Test public void sgroupHierarchy() {

    String cxsmilayers = "|Sg:c:0,1,2,3,4,5,6::,Sg:c:7,8::,Sg:c:9::,Sg:mix:0,1,2,3,4,5,6,7,8,9::,Sg:mix:7,8,9::,SgH:3:4.0,4:2.1|";
    CxSmilesState state = new CxSmilesState();
    assertThat(CxSmilesParser.processCx(cxsmilayers, state), is(not(-1)));
}