public void RemoveElementCompletelyFromFromulaWithHeavyIsotope()
{
ChemicalFormula formulaA = new ChemicalFormula("C2C{13}H3NO");
ChemicalFormula formulaB = new ChemicalFormula("H3NO");
formulaA.Remove(PeriodicTable.GetElement("C"));
Assert.AreEqual(formulaA, formulaB);
}