| N(6)-dimethylallyladenine | 2365-40-4 | | 0 |
| N(G)-Iminoethylornithine | 36889-13-1 | Enzyme Replacements/modifiers | 0 |
| N,N-dimethylarginine | 30315-93-6 | | 0 |
| N-Methylmesoporphyrin | 142234-85-3 | | 0 |
| N-T-Butylhydroxylamine | 16649-50-6 | | 0 |
| N-Tridecanoic Acid | 638-53-9 | | 0 |
| N-Valeric Acid | 109-52-4 | | 0 |
| N-methylnicotinamide | 114-33-0 | Gastrointestinal Agents | 0 |
| N-oleoyldopamine | 105955-11-1 | | 0 |
| N-omega-nitro-L-arginine methyl ester | 50903-99-6 | Enzyme Replacements/modifiers | 0 |
| N-phenylthiourea | 103-85-5 | | 0 |
| N4-Hydroxycytidine | 3258-02-4 | Anti-infective Agents | 0 |
| NADPH | 53-57-6 | Enzyme Replacements/modifiers | 0 |
| Nabiximols | 56575-23-6 | Analgesics | 0 |
| Nacubactam | 1452458-86-4 | Other substances | 0 |
| Nacystelyn | 89344-48-9 | Other substances | 0 |
| Nadecnemab | 2377679-19-9 | Other substances | 0 |
| Nadide | 53-84-9 | Enzyme Replacements/modifiers | 0 |
| Nadofaragene firadenovec | 1823059-12-6 | Antineoplastics | 0 |
| Nafithromycin | 1691240-78-4 | Anti-infective Agents | 0 |
| Naftazone | 15687-37-3 | Cardiac stimulants | 0 |
| Nagrestipen | 166089-33-4 | Other substances | 0 |
| Naldemedine | 916072-89-4 | Other substances | 0 |
| Nalfurafine | 152657-84-6 | Other substances | 0 |
| Nalorphine | 62-67-9 | Antidotes, Deterrents, and Toxicologic Agents | 0 |
| Naluzotan | 740873-06-7 | Central Nervous System Agents | 0 |
| Namilumab | 1206681-39-1 | Other substances | 0 |
| Namitecan | 372105-27-6 | Anticancer drugs | 0 |
| Namodenoson | 163042-96-4 | Central Nervous System Agents | 0 |
| Nanatinostat | 1256448-47-1 | Antineoplastics | 0 |
| Nandrolone hydrogen sulfate | 98804-55-8 | | 0 |
| Nangibotide | 2014384-91-7 | Anti-inflammatory Agents | 0 |
| Nanvuranlat | 1037592-40-7 | Other substances | 0 |
| Napabucasin | 83280-65-3 | | 0 |
| Naphthalen-1-Yl-Acetic Acid | 86-87-3 | | 0 |
| Naphthalene Trisulfonate | | | 0 |
| Naphthalene-2,6-disulfonic acid | 581-75-9 | | 0 |
| Naphthoquine | 173531-57-2 | Antimalarial | 0 |
| Naproxcinod | 163133-43-5 | Anti-inflammatory Agents | 0 |
| n-pentane | 109-66-0 | | 0 |