Let me school you on this one, too. There are polymethylsilanes, polyphosphazines, etc. You aren’t even aware of common polymers like PVC that fall outside of your categories. There’s more exotic stuff like polyferrocenes. You ought to quit spouting off about things you know nothing about.
No, it occurs naturally in grains. Fucking look it up. I’m a biochemist, i know this shit. Here, fuck it: https://pubmed.ncbi.nlm.nih.gov/28244676/.
Gluten is neither synthetic nor semisynthetic.
Ask your doctor if Zoraxy© is right for you.