@Test
public void stereo_ring_closures() throws Exception {

    Pattern ptrn = SmartsPattern.create("[C@@]1(O[C@@]([C@@]([C@]([C@]1(C)O)(C)O)(O)C)(O)C)(O)C");
    assertTrue(ptrn.matches(smi("[C@@]1(O[C@@]([C@@]([C@]([C@]1(C)O)(C)O)(O)C)(O)C)(O)C")));
}