@Test
public void oxidanide() {

    IAtom a = g2c.toCDKAtom(AtomBuilder.aliphatic(Element.Oxygen).hydrogens(1).anion().build(), 1);
    assertThat(a.getSymbol(), is("O"));
    assertThat(a.getImplicitHydrogenCount(), is(1));
    assertThat(a.getFormalCharge(), is(-1));
}