propenidazole

The story

1. Englishpropene
2. Englishpropenoic
3. Englishpropenoate
4. Proto-Indo-European*médʰu
5. Proto-Hellenic*métʰu
6. Ancient Greekμέθυ (méthu)
7. Proto-Indo-European*swel-der.?
8. Ancient Greekῡ̔́λη (hū́lē)
9. GermanMethy
10. Englishme(thyl)
11. Egyptiannṯr
12. Egyptiannṯrj
13. Ancient Greekνῐ́τρον (nĭ́tron)
14. Englishnitro-
15. Egyptianjmn
16. Ancient GreekᾸ̓́μμων (Ắmmōn)
17. LatinAmmōn
18. Latinammoniacus
19. Englishammonia
20. Proto-Indo-European*dʰeh₁-
21. Englishamide
22. Englishimide
23. Proto-Indo-European*né
24. Proto-Indo-European*n̥-
25. Proto-Hellenic*ə-
26. Ancient Greekᾰ̓- (ă-)
27. Proto-Indo-European*gʷeyh₃-
28. Proto-Indo-European*gʷih₃wós
29. Proto-Indo-European*gʷíh₃weti
30. Proto-Hellenic*gʷyṓw-ō
31. Proto-Hellenic*d͏̌ṓwō
32. Ancient Greekζώω (zṓō)
33. Ancient Greekζῶ (zô)
34. Ancient Greekζωή (zōḗ)
35. Frenchazote
36. Englishazote
37. Englishazo-
38. Englishazole
39. Englishimidazole
40. Englishmetronidazole
41. English todaypropenidazole

From prope(noate) + -nidazole (“metronidazole derivative”).