code: public String generateNaturalAnalogSequenceRNA(String notation)
  			throws org.helm.notation2.parser.exceptionparser.NotationException, HELM2HandledException,
  			ValidationException, MonomerLoadingException, ChemistryException {
  		String result = SequenceConverter.getNucleotideNaturalAnalogSequenceFromNotation(validate(notation));
  		setMonomerFactoryToDefault(notation);
  		return result;
  	}
docs: method to generate the natural analogue sequence for all rna-sequences
  from an HELM input
  
  @param notation
  HELM input
  @return natural analogue rna sequences, divided by white spaces
  @throws org.helm.notation2.parser.exceptionparser.NotationException
  if the input complex notation contains non-nucleid acid
  polymer(s)
  @throws HELM2HandledException
  if HELM input contains HELM2 features
  @throws ValidationException
  if the HELM input is not valid
  @throws MonomerLoadingException
  if the MonomerFactory can not be refreshed
  @throws ChemistryException
  if the Chemistry Engine can not be initialized