clorprenaline

The story

1. Proto-Indo-European*ǵʰelh₃-
2. Proto-Indo-European*ǵʰl̥h₃rós
3. Proto-Hellenic*kʰlōrós
4. Ancient Greekχλωρός (khlōrós)
5. Englishchloro-
6. Englishchlor-
7. Ancient Greekῐ̓́σος (ĭ́sos)
8. Englishiso-
9. Frenchpropionique
10. Proto-Indo-European*swel-der.?
11. Ancient Greekῡ̔́λη (hū́lē)
12. Frenchpropyl-
13. Englishpropyl
14. Englishisopropyl
15. Proto-Indo-European*ǵneh₃-
16. Proto-Indo-European*ǵn̥h₃sḱéti
17. Proto-Hellenic*gignṓskō
18. Ancient Greekγιγνώσκω (gignṓskō)
19. Ancient Greekγνώμων (gnṓmōn)
20. Latinnorma
21. Proto-Indo-European*h₂el-
22. Proto-Indo-European*h₂élisder.?
23. Latinnōrmālis
24. Englishnormal
25. Englishnor-
26. Proto-Indo-European*h₂éd
27. Proto-Italic*ad
28. Proto-Italic*ad-
29. Latinad-
30. Englishad-
31. Latinrēn
32. Late Latinrēnāli
33. Englishrenal
34. Englishadrenal
35. Englishadrenaline
36. Englishnoradrenaline
37. Englishisoprenaline
38. English todayclorprenaline

From chlor- + -prenaline (“phenethylamine derivative”).