code: public Depiction depict(Iterable<IAtomContainer> mols) throws CDKException {
          int nMols = FluentIterable.from(mols).size();
          Dimension grid = Dimensions.determineGrid(nMols);
          return depict(mols, grid.height, grid.width);
      }
docs: Depict a set of molecules, they will be depicted in a grid. The grid
  size (nrow x ncol) is determined automatically based on the number
  molecules.
  
  @param mols molecules
  @return depiction
  @throws CDKException a depiction could not be generated
  @see #depict(Iterable, int, int)