1. C02504 compound   3-Carboxy-3-hydroxyisocaproate
                      3-Carboxy-3-hydroxy-isocaproate
                      3-Carboxy-3-hydroxy-4-methylpentanoate
                      2-Isopropylmalate
                      2-Isopropylmalic acid

2. C03215 compound   2-Carboxy-D-arabinitol

3. C05662 compound   3-Carboxy-2-hydroxyadipate
                      (-)-1-Hydroxy-1,2,4-butanetricarboxylate
                      1-Hydroxybutane-1,2,4-tricarboxylate
                      (1R,2S)-1-Hydroxybutane-1,2,4-tricarboxylate
                      Homoisocitrate

4. C05950 compound   20-Carboxy-leukotriene B4
                      20-COOH-LTB4
                      20-COOH-Leukotriene B4
                      5,12-Dihydroxy-delta5,8,11,14-eicosapolyendioic acid

5. C06673 compound   4-Carboxy-4'-sulfoazobenzene

6. C12427 compound   10-Carboxy-13-deoxycarminomycin
                      D 788-1

7. C01693 compound   2-L-Carboxy-2,3-dihydroindole-5,6-quinone
                      L-Dopachrome

8. C04052 compound   5-Carboxy-2-oxohept-3-enedioate
                      5-Oxopent-3-ene-1,2,5-tricarboxylate

9. C04115 compound   4-Carboxy-4-hydroxy-2-oxoadipate
                      4-Hydroxy-4-carboxymethyl-2-oxoglutarate

10. C04234 compound   2-Carboxy-D-arabinitol 1-phosphate

11. C04236 compound   2-Oxo-4-methyl-3-carboxypentanoate
                      3-Carboxy-4-methyl-2-oxopentanoate

12. C04348 compound   (3S)-3-Carboxy-3-hydroxypropanoyl-CoA
                      (3S)-3-Carboxy-3-hydroxypropionyl-CoA
                      Malyl-CoA
                      L-Malyl-CoA

13. C04411 compound   3-Carboxy-2-hydroxy-4-methylpentanoate
                      2-D-threo-hydroxy-3-carboxy-isocaproate
                      3-Isopropylmalate

14. C04441 compound   2-(3-Carboxy-3-aminopropyl)-L-histidine

15. C04451 compound   4-Carboxy-2-hydroxyhexa-2,4-dienedioate

16. C04480 compound   3-Carboxy-2-hydroxymuconate semialdehyde

17. C04484 compound   4-Carboxy-2-hydroxymuconate semialdehyde
                      4-Carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde

18. C04751 compound   5'-Phosphoribosyl-4-carboxy-5-aminoimidazole
                      5'-Phosphoribosyl-5-amino-4-imidazolecarboxylate
                      1-(5'-Phosphoribosyl)-4-carboxy-5-aminoimidazole
                      1-(5'-Phosphoribosyl)-5-amino-4-carboxyimidazole
                      1-(5'-Phosphoribosyl)-5-amino-4-imidazolecarboxylate
                      1-(5-Phospho-D-ribosyl)-5-amino-4-imidazolecarboxylate
                      5-Amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxylate

19. C05364 compound   4-Carboxy-2-oxo-3-hexenedioate

20. C05381 compound   3-Carboxy-1-hydroxypropyl-ThPP

21. C05604 compound   2-Carboxy-2,3-dihydro-5,6-dihydroxyindole
                      Leucodopachrome

22. C05641 compound   5-(3'-Carboxy-3'-oxopropenyl)-4,6-dihydroxypicolinate

23. C05656 compound   5-(3'-Carboxy-3'-oxopropyl)-4,6-dihydroxypicolinate
                      5-(gamma-Carboxy-gamma-oxopropyl)-4,6-dihydroxypicolinate

24. C05854 compound   4-Carboxy-2-oxo-4-pentanoate

25. C14094 compound   2-Carboxy-2-hydroxy-8-carboxychromene

26. C00318 compound   3-Carboxy-2-hydroxy-N,N,N-trimethyl-1-propanaminium
                      (S)-Carnitine
                      L-Carnitine
                      Vitamin BT
                      L-gamma-Trimethyl-beta-hydroxybutyrobetaine

27. C01163 compound   3-Carboxy-cis,cis-muconate
                      beta-Carboxy-cis,cis-muconate
                      cis,cis-Butadiene-1,2,4-tricarboxylate

28. C01278 compound   4-Carboxymuconolactone
                      gamma-Carboxymuconolactone
                      2-Carboxy-2,5-dihydro-5-oxofuran-2-acetate
                      5-Carboxy-2,5-dihydro-2-oxofuran-5-acetate

29. C02636 compound   3-Carboxy-N,N,N-trimethyl-2-oxo-1-propanaminium
                      3-Dehydrocarnitine

30. C03666 compound   2-Carboxy-cis,cis-muconate

31. C04447 compound   3-Carboxy-4-methoxy-N-methyl-2-pyridone

32. C04553 compound   3-Carboxy-2,5-dihydro-5-oxofuran-2-acetate
                      4-Carboxy-2,5-dihydro-2-oxofuran-5-acetate

33. C04692 compound   2-[3-Carboxy-3-(methylammonio)propyl]-L-histidine

34. C04826 compound   5-(3-Carboxy-3-oxopropenyl)-4,6-dihydroxypyridine-2-carboxylate

35. C11629 compound   omega-Carboxy-N-acetyl-LTE4
                      omega-COOH-LTE4NAc
                      (7E,9E,11Z,14Z)-(5S,6R)-6-((N-Acetyl)cystein-S-yl)-5-hydroxyeicosa- 7,9,11,14-tetraen-1,20-dioate

36. C04324 compound   4-Carboxy-2-hydroxy-cis,cis-muconate
                      4-Carboxy-2-hydroxyhexa-2,4-cis,cis-dienedioate

37. C06581 compound   2-Hydroxy-3-carboxy-6-oxo-7-methylocta-2,4-dienoate

38. C11456 compound   cis-3-(1-Carboxy-ethyl)-3,5-cyclo-hexadiene-1,2-diol

39. C11588 compound   cis-3-(Carboxy-ethyl)-3,5-cyclo-hexadiene-1,2-diol
                      cis-3-(2-Carboxy-ethyl)-3,5-cyclo-hexadiene-1,2-diol

40. C13673 compound   (S)-2-Amino-3-(3-carboxy-5-methyl-4-isoxazolyl)porionic acid
                      (S)-ACPA

41. C14095 compound   2-Hydroxy-3-carboxybenzalpyruvate
                      3-(3-Carboxy-3-oxo-1-propenyl)-2-hydroxy-benzoic acid

42. C04876 compound   N-Acetyl-D-glucosaminyl-N-acetylmuramoyl-L-Ala-D-glutamyl-6-carboxy- L-lysine

43. C04804 compound   UDP-N-acetylmuramoyl-L-Ala-D-gamma-Glu-6-carboxy-L-Lys-D-Ala
                      UDP-N-acetylmuramoyl-L-alanyl-D-gamma-glutamyl-6-carboxy-L-lysyl-D- alanine

44. C04828 compound   UDP-N-acetylmuramoyl-L-Ala-D-gamma-Glu-6-carboxy-L-Lys-(D-Ala)2
                      UDP-N-acetylmuramoyl-L-alanyl-D-gamma-glutamyl-6-carboxy-L-lysyl-D- alanyl-D-alanine

45. C04882 compound   UDP-N-acetylmuramoyl-L-alanyl-D-glutamyl-6-carboxy-L-lysyl-D-alanyl- D-alanine
                      UDP-N-acetylmuramoyl-L-alanyl-D-glutamyl-meso-2,6-diaminopimeloyl-D- alanyl-D-alanine

46. C04904 compound   N-Acetyl-D-glucosaminyl-N-acetylmuramoyl-L-Ala-D-glutamyl-6-carboxy- L-lysyl-D-alanine

47. C14049 compound   Dipotassium (3beta,20beta)-20-carboxy-11-oxo-30-norlean-12-en-3-yl-2-O-beta-D- gucopyranuronosyl-alpha-D-glucopyranosiduronate
                      Neubormitin
                      Dipotassium glycyrrhizate
                      Glycyrrhizinate dipotassium

48. C08539 compound   2,6-Pyridinedicarboxylic acid
                      Betanidin