sulbenicillin

The story

1. Latinsulpur
2. Latinsulfur
3. Latinsulphur
4. Anglo-Normansulfre
5. Middle Englishsulphur
6. Englishsulfur
7. Englishsulfo-
8. Arabicلُبَان (lubān)
9. Proto-Indo-European*yew-
10. Proto-Indo-European*yéwos
11. Proto-Indo-Iranian*yáwas
12. Sanskritयव (yava)bor.?
13. Proto-Austronesian*zawa
14. Proto-Malayo-Polynesian*zawader.?
15. Old Javanesejawa
16. Old JavaneseJawi
17. Javaneseꦗꦮꦶ (jawi)
18. Arabicجَاوَة (jāwa)
19. Arabicـِيّ (-iyy)
20. Arabicجَاوِيّ (jāwiyy)
21. Arabicلُبَان جَاوِيّ (lubān jāwiyy)
22. Catalanbenjuí
23. Middle Frenchbenjoin
24. Englishbenzoin
25. Englishbenzo-
26. Englishbenz-
27. Proto-Indo-European*swel-der.?
28. Ancient Greekῡ̔́λη (hū́lē)
29. Englishbenzyl
30. Proto-Indo-European*pes-
31. Proto-Indo-European*pes-ni-s
32. Proto-Italic*peznis
33. Latinpēnis
34. Latinpēniculus
35. Latinpēnicillum
36. Englishpenicillin
37. English todaysulbenicillin

From sul(fo)- + ben(zyl) + (pen)icillin.