src/main/java/org/helm/notation2/parser/notation/HELM2Notation.java
@JsonIgnore
  public List<String> getPolymerIDs() {
    List<String> listOfIDs = new ArrayList<String>();
    for (PolymerNotation polymer : listOfPolymers) {
      listOfIDs.add(polymer.getPolymerID().getId());
    }
    return listOfIDs;
  }
@JsonIgnore
  public List<String> getPolymerIDs() {
    List<String> listOfIDs = new ArrayList<String>();
    for (PolymerNotation polymer : listOfPolymers) {
      listOfIDs.add(polymer.getPolymerID().getId());
    }
    return listOfIDs;
  }
method to get the ID's from all polymers

@return list of all polymers ids