Sorry to meddle, but I thougth I would give my opinion in case it is 
interesting for you.


> - What if you check for this second column of atom names only for  
> files with the .p2n or .P2N extension.

Jmol does not rely on file extensions for reading any format.


> - or we can add a header in the P2N file to distinguish it from the  
> PDB file format; for instance:
> REMARK P2N FILE FORMAT JMOL COMPATIBLE

That would always be good, and probably the best way for Jmol to 
filter these files without confusion.

I think that best is that you conform to PDB standard as much as 
possible. Other software will then be able to read the files without 
trouble, ignoring the extra information.

I would advice putting the alternative atom names AFTER the 80th 
column.
And also adding the element name in the proper place, columns 77-78. 
Relying on the atom name for deducting the element symbol usually 
works, but is risky (as demonstrated often with calcium as well as 
with H atoms with too long names/id/locators). It is much better to 
have the symbol without ambiguity. Current PDB specification enforces 
that; it's only old PDB files and files created by external software 
that omit this field.

Since your software is creating the files, I think all this is easy 
to accomplish.



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