Hi All,

        Can anyone mention any software available freely through which one can find the length of the molecule and also the minimum configuration which this molecule can take.  I would like to
use for a cluster of molecules churn it out through the free energy minimization technique to 
give the ground state of the molecule.

        Most of the compounds which are complex macro protein, enzyme etc., have a pdb file.  I 
would like to know how if one designs a molecule which has no pdb file how to proceed with those
packages.

       thanks in advance,

Viswanath P.


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