carnidazole

The story

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

From car(bamothioate) + -nidazole (“metronidazole derivative”).