| Phytosphingosine-1-P | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Phosphosphingolipids | Details |
| Portulacaxanthin II | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| PPPi | Inorganic compounds | Homogeneous non-metal compounds | Non-metal oxoanionic compounds | Non-metal phosphates | Details |
| Prephenate | Organic compounds | Organic acids and derivatives | Keto acids and derivatives | Gamma-keto acids and derivatives | Details |
| Ribose-1-arsenate | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| S-Prenyl-L-cysteine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Tellurite | Inorganic compounds | Mixed metal/non-metal compounds | Metalloid organides | Metalloid oxides | Details |
| Tetrahydrodipicolinate | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Tetrahydropteroyltri-L-glutamate | Organic compounds | Organoheterocyclic compounds | Pteridines and derivatives | Pterins and derivatives | Details |
| Trimethyl sulfonium | Organic compounds | Organosulfur compounds | Not Available | Not Available | Details |
| Trimethylaminoacetone | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbonyl compounds | Details |
| Ubiquinol-6 | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Polyprenylphenols | Details |
| UDP-4-dehydro-6-deoxy-D-glucose | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Pyrimidine nucleotide sugars | Details |
| UDP-D-apiose | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Pyrimidine ribonucleotides | Details |
| UDP-D-galacturonate | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Pyrimidine nucleotide sugars | Details |
| UDP-L-arabinose | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Pyrimidine ribonucleotides | Details |
| UDP-L-iduronate | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Pyrimidine nucleotide sugars | Details |
| UDP-L-rhamnose | Organic compounds | Nucleosides, nucleotides, and analogues | Pyrimidine nucleotides | Pyrimidine nucleotide sugars | Details |
| Undecaprenyl N-acetyl-glucosaminyl-N-acetyl-mannosaminuronate pyrophosphate | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Polyprenols | Details |
| Undecaprenyl N-acetyl-glucosaminyl-N-acetyl-mannosaminuronate-4-acetamido-4,6-dideoxy-D-galactose pyrophosphate | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Polyprenols | Details |
| Vanillin | Organic compounds | Benzenoids | Phenols | Methoxyphenols | Details |
| Vanillylamine | Organic compounds | Benzenoids | Phenols | Methoxyphenols | Details |
| 2-Methyl-1-hydroxybutyl-ThPP | Organic compounds | Organoheterocyclic compounds | Diazines | Pyrimidines and pyrimidine derivatives | Details |
| 3-O-Sulfogalactosylceramide (d18:1/12:0) | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Glycosphingolipids | Details |
| 3-O-Sulfogalactosylceramide (d18:1/14:0) | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Glycosphingolipids | Details |
| 3-O-Sulfogalactosylceramide (d18:1/18:0) | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Glycosphingolipids | Details |
| 3-O-Sulfogalactosylceramide (d18:1/20:0) | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Glycosphingolipids | Details |
| 3-O-Sulfogalactosylceramide (d18:1/24:1(15Z)) | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Glycosphingolipids | Details |
| Galactosylceramide (d18:1/12:0) | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Glycosphingolipids | Details |
| Galactosylceramide (d18:1/14:0) | Organic compounds | Lipids and lipid-like molecules | Sphingolipids | Glycosphingolipids | Details |
