| Cytidine | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleosides | Not Available | Details |
| Citric acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Tricarboxylic acids and derivatives | Details |
| Cytidine monophosphate | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Pyrimidine ribonucleotides | Details |
| Choline | Organic compounds | Organonitrogen compounds | Quaternary ammonium salts | Cholines | Details |
| D-Xylose | Organic compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Monosaccharides | Details |
| L-Cystathionine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Deoxyadenosine | Organic compounds | Nucleosides, nucleotides, and analogues | Purine nucleosides | Purine 3'-deoxyribonucleosides | Details |
| Galactitol | Organic compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Sugar alcohols | Details |
| Ethanol | Organic compounds | Organooxygen compounds | Alcohols and polyols | Primary alcohols | Details |
| Glycerylphosphorylethanolamine | Organic compounds | Organophosphorus compounds | Organic phosphoric acids and derivatives | Not Available | Details |
| Glyoxylic acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Carboxylic acids | Details |
| Folic acid | Organic compounds | Organoheterocyclic compounds | Pteridines and derivatives | Pterins and derivatives | Details |
| D-Glucose | Organic compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Monosaccharides | Details |
| Glycine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Fructose 6-phosphate | Organic compounds | Organophosphorus compounds | Organic phosphoric acids and derivatives | Phosphate esters | Details |
| Glutathione | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Glycerol 3-phosphate | Organic compounds | Lipids and lipid-like molecules | Glycerophospholipids | Glycerophosphates | Details |
| Glycerol | Organic compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Sugar alcohols | Details |
| Guanine | Organic compounds | Organoheterocyclic compounds | Imidazopyrimidines | Purines and purine derivatives | Details |
| Guanosine | Organic compounds | Nucleosides, nucleotides, and analogues | Purine nucleosides | Not Available | Details |
| Formic acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Carboxylic acids | Details |
| D-Galactose | Organic compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Monosaccharides | Details |
| L-Glutamate | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Ethanolamine | Organic compounds | Organonitrogen compounds | Amines | Alkanolamines | Details |
| Gluconolactone | Organic compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Monosaccharides | Details |
| L-Malic acid | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Fatty acids and conjugates | Details |
| Hypoxanthine | Organic compounds | Organoheterocyclic compounds | Imidazopyrimidines | Purines and purine derivatives | Details |
| L-Tyrosine | Organic compounds | Phenylpropanoids and polyketides | Phenylpropanoic acids | Not Available | Details |
| L-Phenylalanine | Organic compounds | Phenylpropanoids and polyketides | Phenylpropanoic acids | Not Available | Details |
| Inositol | Organic compounds | Organooxygen compounds | Alcohols and polyols | Cyclic alcohols and derivatives | Details |
