-prenaline

The story

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

From isoprenaline.