text: from Tkinter import *
  from frowns.Depict.MoleculeDock import MoleculeDock
  from frowns import Smiles
  
  # read in a molecule
  smiles = ["c1ccccc1C=O",
            "c1ccc2cc1cccc2",
            "CCN",
            "CCCC(=O)NNCC",
            "CCC(CC)([CH](OC(N)=O)C1=CC=CC=C1)C2=CC=CC=C2",
            "ON=C(CC1=CC=CC=C1)[CH](C#N)C2=CC=CC=C2",
            "C1=CC=C(C=C1)C(N=C(C2=CC=CC=C2)C3=CC=CC=C3)C4=CC=CC=C4",
            ]
  
  
  # create the moleculedock widget and place it
  # into a tk window
  tk = top = Tk()
  m = MoleculeDock(top, cols=4)
  m.pack(fill=BOTH, expand=1)
  
  for smile in smiles:
      mol = Smiles.smilin(smile)
      mol.name = smile
      m.addMolecule(mol)
  
  mainloop()
  