1. C01770 compound   1,4-Lactone

2. C00198 compound   Glucarolactone
                      D-Aldonolactone
                      D-Gluconolactone
                      Gluconic lactone
                      delta-Gluconolactone
                      1,5-Gluconolactone
                      Gluconic acid lactone
                      D-Glucono-1,5-lactone
                      D-threo-Aldono-1,5-lactone

3. C00652 compound   D-Arabinono-1,4-lactone

4. C01012 compound   (R)-Pantolactone
                      (R)-Pantoyl lactone
                      (3R)-Dihydro-3-hydroxy-4,4-dimethyl-2(3H)-Furanone

5. C01040 compound   L-Gulonolactone
                      gamma-Gulonolactone
                      L-Gulono-gamma-lactone
                      L-Gulonic acid gamma-lactone
                      L-Gulono-1,4-lactone

6. C01093 compound   Cellobiono-1,5-lactone
                      Cellobiose-1,5-lactone

7. C01114 compound   L-Arabino-1,4-lactone
                      L-Arabinono-1,4-lactone

8. C01115 compound   L-Galactono-1,4-lactone

9. C01125 compound   2-Dehydropantolactone
                      2-Dehydropantoyl lactone
                      Dihydro-4,4-dimethyl-2,3-Furandione

10. C02266 compound   D-Xylonolactone
                      D-Xylono-1,5-lactone

11. C02669 compound   D-Galactonolactone
                      D-Galactono-8-lactone
                      D-Galactono-1,5-lactone

12. C02670 compound   D-Glucuronolactone
                      Glucofuranurono-6,3-lactone
                      D-Glucurono-3,6-lactone
                      Glucurone
                      D-Glucurone
                      D-Glucuronic acid

13. C02692 compound   Hexose-1,5-lactone

14. C02752 compound   Triacetate lactone
                      4-Hydroxy-6-methyl-2-pyrone

15. C02753 compound   D-Xylono-1,4-lactone

16. C02991 compound   L-Rhamno-1,4-lactone

17. C02994 compound   L-Xylono-1,4-lactone

18. C03107 compound   D-Glucono-1,4-lactone

19. C03288 compound   L-Rhamnono-1,4-lactone

20. C03383 compound   gamma-D-Galactonolactone
                      D-Galactono-1,4-lactone

21. C03387 compound   D-Glucurono-6,2-lactone

22. C05162 compound   L-Gulono-1,5-lactone

23. C05405 compound   L-Arabino-1,5-lactone

24. C05410 compound   Gulono-1,4-lactone

25. C06158 compound   D-Fucono-1,4-lactone

26. C09387 compound   Dehydrocostus lactone

27. C09853 compound   1,2-Dihydroxymint lactone

28. C11844 compound   N-Heptanoylhomoserine lactone

29. C01236 compound   6-Phospho-D-glucono-1,5-lactone
                      D-Glucono-1,5-lactone 6-phosphate

30. C03514 compound   Limonoate D-ring-lactone
                      Evodin
                      Limonin
                      Evodia fruit

31. C03586 compound   3-Oxoadipate enol-lactone
                      2-Oxo-2,3-dihydrofuran-5-acetate
                      4,5-Dihydro-5-oxofuran-2-acetate
                      5-Oxo-4,5-dihydrofuran-2-acetate

32. C05851 compound   o-Hydroxycinnamic acid lactone
                      cis-o-Coumarinic acid lactone
                      2-Propenoic acid, 3-(2-hydroxyphenyl)-, d-lactone
                      Coumarine
                      Cumarin
                      Rattex
                      Coumarinic anhydride
                      1,2-Benzopyrone
                      Benzo-a-pyrone
                      Tonka bean camphor
                      2H-1-Benzopyran-2-one
                      5,6-Benzo-2-pyrone

33. C06095 compound   Gibberellin A44 open-lactone
                      Gibberellin A44 diacid

34. C06440 compound   2-Dehydro-D-glucono-1,5-lactone

35. C09476 compound   7alpha-Hydroxydehydrocostus lactone

36. C11837 compound   N-Butyryl-L-homoserine lactone

37. C11839 compound   N-(3-Oxohexanoyl)homoserine lactone

38. C11840 compound   N-(3-Oxododecanoyl)homoserine lactone

39. C11841 compound   N-(3-Oxooctanoyl)homoserine lactone
                      N-(3-Oxooctanoyl)-L-homoserine lactone
                      OOHL

40. C11842 compound   N-(3-(S)-Hydroxybutyryl)homoserine lactone

41. C12087 compound   p-Coumaroyltriacetic acid lactone

42. C04251 compound   Deoxylimononic acid D-ring-lactone

43. C04676 compound   Testololactone
                      3-Oxo-13,17-secoandrost-4-ene-17,13alpha-lactone

44. C11845 compound   N-(3-Hydroxy-7-cis-tetradecenoyl)homoserine lactone