| Beta-Alanine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Acetoacetic acid | Organic compounds | Organic acids and derivatives | Keto acids and derivatives | Short-chain keto acids and derivatives | Details |
| Adenosine 3',5'-diphosphate | Chemical entities | Organic compounds | Nucleosides, nucleotides, and analogues | Purine nucleotides | Details |
| L-Carnitine | Organic compounds | Organic nitrogen compounds | Organonitrogen compounds | Quaternary ammonium salts | Details |
| Creatine | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| Epinephrine | Organic compounds | Benzenoids | Phenols | Benzenediols | Details |
| Pipecolic acid | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| Deoxyinosine | Chemical entities | Organic compounds | Nucleosides, nucleotides, and analogues | Purine nucleosides | Details |
| cis-Aconitic acid | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| Dopamine | Organic compounds | Benzenoids | Phenols | Benzenediols | Details |
| Dihydrouracil | Chemical entities | Organic compounds | Organoheterocyclic compounds | Diazines | Details |
| Cysteinylglycine | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| Dihydrothymine | Chemical entities | Organic compounds | Organic acids and derivatives | Organic carbonic acids and derivatives | Details |
| Cytidine triphosphate | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |
| Deoxyguanosine | Chemical entities | Organic compounds | Nucleosides, nucleotides, and analogues | Purine nucleosides | Details |
| Glycerophosphocholine | Chemical entities | Organic compounds | Lipids and lipid-like molecules | Glycerophospholipids | Details |
| Dimethylglycine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Citric acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Tricarboxylic acids and derivatives | Details |
| Cytidine monophosphate | Chemical entities | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Details |
| Choline | Organic compounds | Organic nitrogen compounds | Organonitrogen compounds | Quaternary ammonium salts | Details |
| D-Xylose | Chemical entities | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Details |
| L-Cystathionine | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| Deoxyadenosine | Chemical entities | Organic compounds | Nucleosides, nucleotides, and analogues | Purine nucleosides | Details |
| Ethanol | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Alcohols and polyols | Details |
| Gamma-Aminobutyric acid | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| Glycerylphosphorylethanolamine | Chemical entities | Organic compounds | Organic acids and derivatives | Organic phosphoric acids and derivatives | Details |
| Glycolic acid | Chemical entities | Organic compounds | Organic acids and derivatives | Hydroxy acids and derivatives | Details |
| Homovanillic acid | Chemical entities | Organic compounds | Benzenoids | Phenols | Details |
| Glyoxylic acid | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |
| Folic acid | Chemical entities | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Details |