Re: [Open Babel] pyridinium and MMFF94

2010-07-21 Thread Geoffrey Hutchison
> You are right, using a correct SMILES string type assignment is perfect. Are > you aware of a 3D-coordinate format from which OpenBabel could be able to > extract formal charge information in order to assign types properly while > retaining 3D coordinates rather than rebuilding them as startin

Re: [Open Babel] pyridinium and MMFF94

2010-07-20 Thread Geoffrey Hutchison
> downloaded through SVN (20 July 2010), fails to assign correct atom > types to pyridinium ion; namely, aromaticity is not perceived, and all In what form are you importing the molecule? SMILES? PDB? If there is no assigned formal charge to the pyridinium nitrogen, then there is no guaranteed

[Open Babel] pyridinium and MMFF94

2010-07-20 Thread Paolo Tosco
Dear OpenBabel developers, I noticed that obenergy, as of the current development version downloaded through SVN (20 July 2010), fails to assign correct atom types to pyridinium ion; namely, aromaticity is not perceived, and all atoms are assigned aliphatic atom types (2 for carbon, 8 for nitro