code: public static String getSequence(PolymerNotation one)
  			throws RNAUtilsException, HELM2HandledException, ChemistryException {
  		checkRNA(one);
  
  		List<Nucleotide> nucleotideList = getNucleotideList(one);
  		StringBuffer sb = new StringBuffer();
  		for (int i = 0; i < nucleotideList.size(); i++) {
  			sb.append(nucleotideList.get(i).getNaturalAnalog());
  		}
  		return sb.toString();
  
  	}
docs: method to get the rna sequence of the given PolymerNotation
  
  @param one
  PolymerNotation
  @return sequence
  @throws RNAUtilsException if the polymer is not a RNA/DNA
  @throws HELM2HandledException if it contains helm2 specific features can not be casted to HELM1 Format
  @throws ChemistryException if chemistry engine can not be initialized