diphosphooligosaccharide

The story

1. Proto-Indo-European*dwóh₁
2. Proto-Indo-European*dwi-
3. Proto-Hellenic*dwi-
4. Ancient Greekδῐ- (dĭ-)
5. Latindi-
6. Englishdi-
7. Proto-Indo-European*bʰeh₂-
8. Proto-Indo-European*bʰéh₂os
9. Proto-Hellenic*pʰáwos
10. Ancient Greekφᾰ́ος (phắos)
11. Ancient Greekφῶς (phôs)
12. Proto-Indo-European*bʰer-
13. Proto-Indo-European*bʰéreti
14. Proto-Hellenic*pʰérō
15. Ancient Greekφέρω (phérō)
16. Ancient Greekφωσφόρος (phōsphóros)
17. Latinphōsphorus
18. Englishphosphorus
19. Englishphospho-
20. Ancient Greekὀλῐ́γος (olĭ́gos)
21. Englisholigo-
22. Proto-Indo-European*ḱorkeh₂
23. Proto-Indo-Iranian*ćárkaraH
24. Proto-Indo-Aryan*śárkaraH
25. Sanskritशर्क॑रा (śárkarā)
26. Palisakkharā
27. Ancient Greekσάκχαρ (sákkhar)
28. Latinsaccharon
29. Latinsaccharum
30. Englishsaccharo-
31. Proto-Indo-European*dʰeh₁-
32. Englishsaccharide
33. Englisholigosaccharide
34. English todaydiphosphooligosaccharide

From di- + phospho- + oligosaccharide.