@hmacdope I had a quick look now into it to see if there are good websites, where the whole nomenclature is located and also found mainly the full nomenclature on the glycam website itself, with it also containing the PDB/CHARMM nomenclature for the sugars :

https://glycam.org/docs/othertoolsservice/2016/06/09/3d-snfg-list-of-residue-names/index.html

Here is the second location where I found a collection of all of the glycam abbreviations:

https://github.com/pablo-arantes/making-it-rain/blob/main/Glycam.ipynb

I guess it would be then also good to have in the same direction to have also a water selector, but here I don't know any resource that would have all of the water abbreviations collected in one place, so it would be possibly more checking/researching required, especially if we want to cover some less common water abbreviations.