code: @Override
      public String[] getParameterNames() {
          String[] params = new String[3];
          params[0] = "maxIterations";
          params[1] = "lpeChecker";
          params[2] = "maxResonStruc";
          return params;
      }
docs: Gets the parameterNames attribute of the SigmaElectronegativityDescriptor
  object
  
  @return    The parameterNames value