Hi, 

I am trying to use minimization feature using uff but it is adding hydrogens to 
fill the shell. How do I prevent from addition of any additional atoms beyond 
what is in the input file. 

Here is a same input and the command I am using. 

Input.mol




3  2   0  0  0  0  0  0  0  0999 V2000
    0.0000   -0.0000   -0.0000 Li   0  0  0  0  0  0  0  0  0  0  0  0
    0.4622   -0.2286   -0.0600 O    0  0  0  0  0  0  0  0  0  0  0  0
   -0.4434    0.2193    0.0576 O    0  0  0  0  0  0  0  0  0  0  0  0
 1 2  1  0  0  0  0
 1 3  1  0  0  0  0
M  END

Command: obabel input.mol -O output.mol --minimize --steps 10000 --sd --ff uff


output.mol:


 OpenBabel03302314253D

  5  4  0  0  0  0  0  0  0  0999 V2000
   -0.0207   -0.0375   -0.0870 Li  0  0  0  0  0  0  0  0  0  0  0  0
    1.7549   -0.3412   -0.5469 O   0  0  0  0  0  0  0  0  0  0  0  0
   -1.7957    0.2668    0.3744 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.2720    0.2359    0.0697 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.7870    0.3281    1.3627 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
  1  3  1  0  0  0  0
  2  4  1  0  0  0  0
  3  5  1  0  0  0  0
M  END
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