@Test
public void seaborgiumAbsMass() throws Exception {

    try (InputStream in = getClass().getResourceAsStream("seaborgium_abs.mol");
         MDLV2000Reader mdlr = new MDLV2000Reader(in, Mode.STRICT)) {
        IAtomContainer mol = mdlr.read(new AtomContainer());
        assertThat(mol.getAtom(0).getMassNumber(), is(261));
    }
}