etomidate

The story

1. Proto-Indo-European*h₂eydʰ-
2. Proto-Hellenic*áitʰō
3. Ancient Greekαἴθω (aíthō)
4. Ancient Greekᾱ̓ήρ (āḗr)influ.?
5. Ancient Greekαἰθήρ (aithḗr)
6. Latinaethēr
7. GermanÄther
8. GermanEther
9. Proto-Indo-European*swel-der.?
10. Ancient Greekῡ̔́λη (hū́lē)
11. GermanEthy
12. Englisheth(yl)
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. English(i)mid(azole)
38. Englishcarboxylic acid
39. English(carboxyl)ate
40. English todayetomidate

From eth(yl) + -o- + (i)mid(azole) + (carboxyl)ate.