| (+)-Manibacanine | Organic compounds | Alkaloids and derivatives | Protoberberine alkaloids and derivatives | Not Available | Details |
| Masonine | Organic compounds | Alkaloids and derivatives | Amaryllidaceae alkaloids | Homolycorine-type amaryllidaceae alkaloids | Details |
| Mauritine J | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Microginin 299B | Organic compounds | Organic acids and derivatives | Peptidomimetics | Hybrid peptides | Details |
| Microginin 299C | Organic compounds | Organic acids and derivatives | Peptidomimetics | Hybrid peptides | Details |
| Microginin 299D | Organic compounds | Organic acids and derivatives | Peptidomimetics | Hybrid peptides | Details |
| Mollisine | Organic compounds | Alkaloids and derivatives | Aporphines | Not Available | Details |
| Montanastatin | Organic compounds | Organic acids and derivatives | Peptidomimetics | Depsipeptides | Details |
| Motuporamine B | Organic compounds | Organic nitrogen compounds | Organonitrogen compounds | Amines | Details |
| Munzianine | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Diterpenoids | Details |
| Muramine | Organic compounds | Alkaloids and derivatives | Protopine alkaloids | Not Available | Details |
| Muricatisine | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbonyl compounds | Details |
| Murrayamine J | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Carbazoles | Details |
| Murrayamine K | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Carbazoles | Details |
| Murrayamine M | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Carbazoles | Details |
| N,N-Didemethylculantraramine | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Monoterpenoids | Details |
| N,N-Didesmethylgrossularine 1 | Organic compounds | Organoheterocyclic compounds | Indoles and derivatives | Pyridoindoles | Details |
| Naamine C | Organic compounds | Benzenoids | Phenols | Methoxyphenols | Details |
| N-Deacetylisoretuline | Organic compounds | Alkaloids and derivatives | Strychnos alkaloids | Not Available | Details |
| N-Demethylalfileramine | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| N-Demethylhuperzinine | Organic compounds | Organoheterocyclic compounds | Quinolines and derivatives | Quinolones and derivatives | Details |
| Neofolitispate 1 | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Fatty acid esters | Details |
| N-Methylcrinasiadine | Organic compounds | Organoheterocyclic compounds | Tetrapyrroles and derivatives | Porphyrins | Details |
| N-Methylviguine | Organic compounds | Organoheterocyclic compounds | Isoquinolines and derivatives | Benzylisoquinolines | Details |
| Nordercitin | Organic compounds | Organoheterocyclic compounds | Quinolines and derivatives | Benzoquinolines | Details |
| Norisocorytuberine | Organic compounds | Alkaloids and derivatives | Aporphines | Not Available | Details |
| (-)-N-Demethylroehybridine | Organic compounds | Alkaloids and derivatives | Harmala alkaloids | Not Available | Details |
| Norsanguinine | Organic compounds | Organoheterocyclic compounds | Benzazepines | Not Available | Details |
| Norsarcocapnine | Organic compounds | Alkaloids and derivatives | Cularin alkaloids and derivatives | Not Available | Details |
| Nummularine S | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
