| Succinyladenosine | Organic compounds | Nucleosides, nucleotides, and analogues | Purine nucleosides | Not Available | Details |
| Vanillactic acid | Organic compounds | Phenylpropanoids and polyketides | Phenylpropanoic acids | Not Available | Details |
| Uroporphyrin III | Organic compounds | Organoheterocyclic compounds | Tetrapyrroles and derivatives | Porphyrins | Details |
| Ursocholic acid | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Bile acids, alcohols and derivatives | Details |
| CE(18:1(9Z)) | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Steroid esters | Details |
| 11a-Hydroxyprogesterone | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Pregnane steroids | Details |
| Cholestenone | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Cholestane steroids | Details |
| Taurallocholic acid | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Indolyl carboxylic acids and derivatives | Details |
| Trimethylamine N-oxide | Organic compounds | Organic nitrogen compounds | Organonitrogen compounds | Aminoxides | Details |
| Valerylglycine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| L-Tryptophan | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Indolyl carboxylic acids and derivatives | Details |
| trans-Cinnamic acid | Organic compounds | Phenylpropanoids and polyketides | Cinnamic acids and derivatives | Cinnamic acids | Details |
| Tauro-b-muricholic acid | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Bile acids, alcohols and derivatives | Details |
| Traumatic acid | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Fatty acids and conjugates | Details |
| Uridine diphosphate acetylgalactosamine 4-sulfate | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Pyrimidine ribonucleotides | Details |
| Uridine diphosphate glucuronic acid | Organic compounds | Organoheterocyclic compounds | Lactones | Gamma butyrolactones | Details |
| Uroporphyrin I | Organic compounds | Organoheterocyclic compounds | Tetrapyrroles and derivatives | Porphyrins | Details |
| S-Adenosylhomocysteine | Organic compounds | Organoheterocyclic compounds | Lactones | Gamma butyrolactones | Details |
| Threonolactone | Organic compounds | Organoheterocyclic compounds | Lactones | Gamma butyrolactones | Details |
| Cholest-5-ene | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Cholestane steroids | Details |
| Tetrahydroneopterin | Organic compounds | Organoheterocyclic compounds | Pteridines and derivatives | Pterins and derivatives | Details |
| Threonic acid | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Behenic acid | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Fatty acids and conjugates | Details |
| Ursodeoxycholic acid | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Bile acids, alcohols and derivatives | Details |
| Undecanoic acid | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Fatty acids and conjugates | Details |
| Tetrahydrocortisol | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Hydroxysteroids | Details |
| Cer(d18:1/23:0) | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Ceramides | Details |
| Suberylglycine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| trans-Ferulic acid | Organic compounds | Phenylpropanoids and polyketides | Cinnamic acids and derivatives | Hydroxycinnamic acids and derivatives | Details |
| Pyrocatechol | Organic compounds | Benzenoids | Phenols | Benzenediols | Details |
