| Orotic acid | Organic compounds | Organoheterocyclic compounds | Diazines | Pyrimidines and pyrimidine derivatives | Details |
| Mevalonic acid | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Fatty acids and conjugates | Details |
| Nicotinamide ribotide | Organic compounds | Nucleosides, nucleotides, and analogues | Pyridine nucleotides | Nicotinamide nucleotides | Details |
| N-Acetylneuraminic acid | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Quinolinic acid | Organic compounds | Organoheterocyclic compounds | Pyridines and derivatives | Pyridinecarboxylic acids and derivatives | Details |
| Testosterone | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Androstane steroids | Details |
| Thiamine | Organic compounds | Organoheterocyclic compounds | Diazines | Pyrimidines and pyrimidine derivatives | Details |
| Propionic acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Carboxylic acids | Details |
| Sepiapterin | Organic compounds | Organoheterocyclic compounds | Pteridines and derivatives | Pterins and derivatives | Details |
| Pyridoxine | Organic compounds | Organoheterocyclic compounds | Pyridines and derivatives | Pyridoxines | Details |
| Sulfite | Inorganic compounds | Homogeneous non-metal compounds | Non-metal oxoanionic compounds | Non-metal sulfites | Details |
| Protoporphyrin IX | Organic compounds | Organoheterocyclic compounds | Tetrapyrroles and derivatives | Porphyrins | Details |
| Pyruvic acid | Organic compounds | Organic acids and derivatives | Keto acids and derivatives | Alpha-keto acids and derivatives | Details |
| Riboflavin | Organic compounds | Organoheterocyclic compounds | Pteridines and derivatives | Alloxazines and isoalloxazines | Details |
| Porphobilinogen | Organic compounds | Organic nitrogen compounds | Organonitrogen compounds | Amines | Details |
| Tetrahydrofuran | Organic compounds | Organoheterocyclic compounds | Tetrahydrofurans | Not Available | Details |
| Sorbitol | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Thyroxine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Pyrophosphate | Inorganic compounds | Homogeneous non-metal compounds | Non-metal oxoanionic compounds | Non-metal pyrophosphates | Details |
| Taurine | Organic compounds | Organic acids and derivatives | Organic sulfonic acids and derivatives | Organosulfonic acids and derivatives | Details |
| Sphingosine | Organic compounds | Organic nitrogen compounds | Organonitrogen compounds | Amines | Details |
| Pregnenolone | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Pregnane steroids | Details |
| Succinic acid | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Dicarboxylic acids and derivatives | Details |
| Squalene | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Triterpenoids | Details |
| Thiosulfate | Inorganic compounds | Homogeneous non-metal compounds | Non-metal oxoanionic compounds | Non-metal thiosulfates | Details |
| Sucrose | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Serotonin | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Tryptamines and derivatives | Details |
| Thymine | Organic compounds | Organoheterocyclic compounds | Diazines | Pyrimidines and pyrimidine derivatives | Details |
| Phosphoenolpyruvic acid | Organic compounds | Organic acids and derivatives | Organic phosphoric acids and derivatives | Phosphate esters | Details |
| Liothyronine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
