| Ferrocytochrome | Organic compounds | Organoheterocyclic compounds | Tetrapyrroles and derivatives | Metallotetrapyrroles | Details |
| Gonadotropin releasing hormone | Organic compounds | Organic Polymers | Polypeptides | Not Available | Details |
| Hypothiocyanite | Organic compounds | Organosulfur compounds | Thiocyanates | Not Available | Details |
| Kinetensin 1-3 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Kinetensin 1-7 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Kinetensin 1-8 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Kinetensin 4-7 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Kinetensin 4-8 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Kinetensin | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Leukoaminochrome | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Indolines | Details |
| Leukotriene C5 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Leukotriene D5 | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Eicosanoids | Details |
| Lipoyllysine | Organic compounds | Organoheterocyclic compounds | Dithiolanes | Lipoamides | Details |
| Neuromedin B (1-3) | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Neuromedin B (4-10) | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Neuromedin B | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Neuromedin C 1-8 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Neuromedin C | Organic compounds | Organic Polymers | Polypeptides | Not Available | Details |
| Neuromedin N (1-4) | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Fatty acyl thioesters | Details |
| Neuromedin N | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Neurotensin 1-10 | Organic compounds | Organic Polymers | Polypeptides | Not Available | Details |
| Neurotensin 11-13 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Noradrenochrome o-semiquinone | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Indolines | Details |
| Noradrenochrome | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Not Available | Details |
| O2'-4a-cyclic-tetrahydrobiopterin | Organic compounds | Organoheterocyclic compounds | Pteridines and derivatives | Pterins and derivatives | Details |
| Oxytocin 1-8 | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Palmitoylglycine | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| S-(11-hydroxy-9-deoxy-delta12-PGD2)-glutathione | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| S-(11-OH-9-deoxy-delta9,12-PGD2)-glutathione | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| S-(9-deoxy-delta12-PGD2)-glutathione | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |