hexoprenaline

The story

1. Proto-Indo-European*swéḱs
2. Proto-Hellenic*hwéks
3. Ancient Greekἕξ (héx)
4. Ancient Greekἑξα- (hexa-)
5. Latinhexa-
6. Englishhexa-
7. Englishhex-
8. Englishhexane
9. Proto-Indo-European*swel-der.?
10. Ancient Greekῡ̔́λη (hū́lē)
11. Englishhexyl
12. Ancient Greekῐ̓́σος (ĭ́sos)
13. Englishiso-
14. Frenchpropionique
15. Ancient Greekῡ̔́λη (hū́lē)
16. Frenchpropyl-
17. Englishpropyl
18. Englishisopropyl
19. Proto-Indo-European*ǵneh₃-
20. Proto-Indo-European*ǵn̥h₃sḱéti
21. Proto-Hellenic*gignṓskō
22. Ancient Greekγιγνώσκω (gignṓskō)
23. Ancient Greekγνώμων (gnṓmōn)
24. Latinnorma
25. Proto-Indo-European*h₂el-
26. Proto-Indo-European*h₂élisder.?
27. Latinnōrmālis
28. Englishnormal
29. Englishnor-
30. Proto-Indo-European*h₂éd
31. Proto-Italic*ad
32. Proto-Italic*ad-
33. Latinad-
34. Englishad-
35. Latinrēn
36. Late Latinrēnāli
37. Englishrenal
38. Englishadrenal
39. Englishadrenaline
40. Englishnoradrenaline
41. Englishisoprenaline
42. English todayhexoprenaline

From hex(yl) + -o- + -prenaline (“phenethylamine derivative”).