code: public String generateJSON(String helm)
  			throws ValidationException, MonomerLoadingException, ChemistryException, JsonProcessingException {
  		String result = HELM2NotationUtils.toJSON(validate(helm));
  		setMonomerFactoryToDefault(helm);
  		return result;
  	}
docs: method to generate JSON-Output for the HELM
  
  @param helm
  HELM input
  @return HELM as JSON-objects
  @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
  @throws JsonProcessingException
  if json can not be produced