1. C00060 compound   Carboxylic acid
                      Carboxylate
                      Monocarboxylate
                      R-COOH

2. C02391 compound   Carboxylic ester

3. C00295 compound   Uracil-6-carboxylic acid
                      Orotate
                      Orotic acid

4. C00539 compound   Aromatic carboxylic acid
                      Aromatic acid

5. C01234 compound   1-Aminocyclopropane-1-carboxylic acid
                      1-Aminocyclopropane-1-carboxylate

6. C01424 compound   Pyrogallol-5-carboxylic acid
                      Gallate
                      Gallic acid
                      3,4,5-Trihydroxybenzoate
                      3,4,5-Trihydroxybenzoic acid

7. C01879 compound   5-Pyrrolidone-2-carboxylic acid
                      Pyroglutamate
                      5-Oxoproline
                      Pyroglutamic acid

8. C02237 compound   D-5-Pyrrolidone-2-carboxylic acid
                      D-Pyroglutamic acid
                      5-Oxo-D-proline

9. C02238 compound   L-5-Pyrrolidone-2-carboxylic acid
                      L-Pyroglutamic acid
                      5-Oxo-L-proline

10. C03030 compound   Uracil 5-carboxylic acid
                      Uracil 5-carboxylate

11. C03203 compound   1-Naphthol-2-carboxylic acid
                      1-Hydroxy-2-naphthoate
                      1-Hydroxy-2-naphthoic acid

12. C03564 compound   1-Pyrroline-2-carboxylic acid
                      1-Pyrroline-2-carboxylate

13. C05722 compound   D-Pyrrolidone-5-carboxylic acid
                      D-Pyrrolidone-5-carboxylate

14. C08267 compound   Azetidyl-2-carboxylic acid
                      (S)-(-)-Azetidine-2-carboxylic acid
                      L-Azetidine 2-carboxylic acid

15. C12101 compound   1-Cyclohexenecarboxylic acid
                      Cyclohex-1-enecarboxylic acid
                      1-Cyclohexene-1-carboxylic acid

16. C12120 compound   6-Acetophenazine-1-carboxylic acid
                      6-Acetylphenazine-1-carboxylic acid

17. C13697 compound   Diphenylamine-2-carboxylic acid
                      DPC
                      Fenamic acid

18. C13699 compound   Anthracene-9-carboxylic acid
                      A9C
                      9-Anthroic acid

19. C00347 compound   Long-chain carboxylic acid
                      Long-chain carboxylate

20. C06669 compound   1-Carbapen-2-em-3-carboxylic acid

21. C09003 compound   2,2-Dimethyl-8-prenylchromene 6-carboxylic acid

22. C13696 compound   (+)-trans-(1S,3S)-3-Aminocyclopentane-1-carboxylic acid
                      (+)-TACP

23. C06321 compound   1,6-Dihydroxy-cis-2,4-cyclohexadiene-1-carboxylic acid
                      cis-1,2-Dihydroxycyclohexa-3,5-diene-1-carboxylate

24. C10264 compound   3-Hydroxy-5-methoxy-6-prenylstilbene-2-carboxylic acid

25. C12264 compound   6-(2-Methoxyvinyl)benzo[1,3]dioxole-5-carboxylic acid

26. C06729 compound   4-Methylcyclohexa-3,5-diene-1,2-cis-diol-1-carboxylic acid
                      cis-1,2-Dihydroxy-4-methylcyclohexa-3,5-diene-1-carboxylate

27. C07522 compound   1-(1-Phenylethyl)-imidazole-5-carboxylic acid, ethyl ester
                      Amidate
                      Etomidate

28. C10969 compound   1-(4'-chlorophenyl)-1,4-dihydro-4-oxo-5-propoxycinnoline-3- carboxylic acid
                      SC-1271

29. C13771 compound   2'-(Benzyloxycarbonylaminomethyl)biphenyl-2-carboxylic acid 2-(2-pyridyl)ethylamide
                      S9947

30. C11468 compound   3,4-Dihydro-7-methoxy-2-methylene-3-oxo-2H-1,4-benzoxazine-5- carboxylic acid
                      Benzoxazolinate