Hello, James 

Precisely! 
PDB format has no place for atom labels or annotations, that why Jmol 
cannot save that.
You can save to a "JMOL" file which is a file (actually a gzipped set 
of files) that holds everything. Of course, that file can only be 
opened by Jmol, You can also save to a special png file (called PNGJ) 
that includes a snapshot of the model and will be loaded as an image 
by external software but as a full model by Jmol.

I don't know of any file format that can hold annotations for each 
atom. Several allow comments. Maybe the newer MOL3000 has a place, 
but I never read about it.

>     This opens up what is perhaps a more general question. I don't think 
>     JMol always supports all of the possible data fields for the file 
>     formats it can use. Is there documentation about which features 
>     should be assumed to work (I'm particularly thinking of when using 
>     "write CD|MOL|PDB|SDF|V2000|XYZ|XYZRN|XYZVIB "

Not exhaustive, but for several formats and features there is some 
documentation in the Wiki, see
http://wiki.jmol.org/index.php/File_formats
and there
Coordinates
Support for bond orders
Support for isotopes
Support for stereochemistry 

As for export, it's msotly just the atom properties that are written 
to file (ccordinates, identities...).



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