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