brobactam

The story

1. Ancient Greekβρῶμος (brômos)
2. Frenchbrome
3. Englishbrome
4. Englishbromine
5. Englishbromo-
6. Proto-Semitic*bayt-
7. Phoenician𐤁𐤕 (bt)
8. Ancient Greekβῆτᾰ (bêtă)
9. Englishbeta
10. Latinlac
11. Englishlacto-
12. GermanKeton
13. Englishketone
14. Englishlac(tone)
15. Egyptianjmn
16. Ancient GreekᾸ̓́μμων (Ắmmōn)
17. LatinAmmōn
18. Latinammoniacus
19. Englishammonia
20. Proto-Indo-European*dʰeh₁-
21. Englisham(ide)
22. Englishlactam
23. Englishbeta-lactam
24. Proto-Indo-European*dwóh₁
25. Proto-Indo-European*trísinflu.
26. Proto-Indo-European*dwís
27. Ancient Greekδιά (diá)
28. Ancient Greekδῐᾰ- (dĭă-)
29. Proto-Indo-European*steh₂-
30. Proto-Indo-European*stísteh₂ti
31. Proto-Hellenic*hístāmi
32. Ancient Greekῐ̔́στημῐ (hĭ́stēmĭ)
33. Ancient Greekδῐῐ̈́στημῐ (dĭĭ̈́stēmĭ)
34. Ancient Greekδῐᾰ́στᾰσῐς (dĭắstăsĭs)
35. Englishdiastase
36. Englishbeta-lactamase
37. English todaybrobactam

From bro(mo)- + -bactam (“β-lactamase inhibitor”).