Hi,

I’m an OpenBabel newbie so I apologize for this very basic question, but I 
can’t seem to find the answer in the documentation or the discussion list 
archives. 
I’m also not a chemistry expert so that probably doesn’t help. 

Does OBIsomorphismMapper consider the atomic numbers of the atoms in a molecule 
when determining whether or not an isomorphism exists? In other words, should 
there be an isomorphism between CH4 and CCl4? If by default the atomic numbers 
are not considered, is there a way to ask OpenBabel to take them into account? 

I looked through the source code and didn’t see this check happening in 
isomorphism.cpp, and I wrote some test code that is saying CH4 and CCl4 are 
isomorphic, but I’m wondering if I’m doing something wrong or this is what the 
library is intended to do. 

Thanks!

James
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