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The R side chains are not referred to as radicals. R- is common in organic chemistry and refers to a part of a molecule not shown for some reason. Generally because it's not the focus in the specific figure. Generally you'll have a R = (whatever combination of atoms) defined below.
Radicals are a specific atom with an unpaired valence electron. Sometimes also called "free radicals".
Edit, here's an example of a non-amino acid use of R:
Fixed - thanks for pointing this out. My brain farted the word out of nowhere, the correct term in this context would be "side chain".
I'm aware of the usage of R in org chem.
Sorry, I hope I didn't come off as condescending or anything. Getting thoughts into words is difficult sometimes haha. But I just take any chance I can (there's not too many) to talk about chemistry.
Your original post explained everything very well, thanks for contributing.
Don't worry, you didn't sound condescending - you went straight for the issue, and then added further info.
Completely off-topic: I'm curious on your example. Most benzopyrazine synthesis routes that I've seen use IBX instead of SSA. Is this a recent development?