code: @Override
      public IRenderingElement generate(IReaction reaction, RendererModel model) {
          ElementGroup elementGroup = new ElementGroup();
          IAtomContainerSet reactants = reaction.getReactants();
          if (reactants != null) {
              elementGroup.add(this.generate(reactants));
          }
  
          IAtomContainerSet products = reaction.getProducts();
          if (products != null) {
              elementGroup.add(this.generate(products));
          }
  
          return elementGroup;
      }
docs: {@inheritDoc}