Hi,

I'm trying to add Explicit Hydrogens to a molecule in order to compute 
qsar descriptors.
When I'm trying to do that I get an error message "The IAtomType was 
null." Traking the error led me to the CDKAtomTypeMatcher and the 
following lines in  the  'perceiveNitrogens' function:

  } else if (atomContainer.getConnectedBondsCount(atom) > 3) {
             // FIXME: I don't perceive carbons with more than 3 
connections yet
             return null;

My compounds have Nitrogens with 4 Bonds. Is there a workaround for this 
problem? By the way computing qsar descriptors without adding hydrogens 
yields the same error for some descriptor classes.

Özgür

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