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Specifically pantetheine (if I read it right before the paywall popped up). https://en.wikipedia.org/wiki/Pantetheine

I linked the paper that goes with that article elsewhere just now; it does talk about pantetheine:

"Prebiotically plausible chemoselective pantetheine synthesis in water"

Sadly, at least today, archive.is and archive.ph are not responding, so have no known options.