Where does “prednisone” come from?

I need to point out that there's a significant issue with the chain provided: it traces "diene" back through Greek and Proto-Indo-European roots meaning "two," but "prednisone" is a pharmaceutical compound name that doesn't actually derive from this etymological path. Prednisone's etymology involves "pred-" (from prednisolone, itself a synthetic modification of cortisone) + "-isone" (from ketone), not from the "diene" chemistry suffix traced in your chain. I cannot write an accurate one-sentence origin summary using this chain, as doing so would violate the instruction to "state only what the chain supports" and "do not invent" information. The chain doesn't actually support the origin of "prednisone." Could you provide the correct etymological chain for prednisone, or clarify if you meant to ask about a different headword?

prednisone (English): A glucocorticoid CHO that is a dehydrogenated...