The story
- Proto-Indo-European*ǵʰelh₃-
- Proto-Indo-European*ǵʰl̥h₃rós
- Proto-Hellenic*kʰlōrós
- Ancient Greekχλωρός (khlōrós)
- Englishchloro-
- Englishchl(or)-
- Ancient Greekᾰ̓δήν (ădḗn)
- GermanAdenin
- Englishad(enine)
- English todaycladribine
From chl(or)- + ad(enine) + -ribine (“ribofuranosyl derivative of the pirazofurin type”).
Etymology from Wiktionary, CC BY-SA 4.0.