azanidazole

The story

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

From aza- + -nidazole (“metronidazole derivative”).