| 3,8-Dihydroxy-1,7-dimethoxyxantone | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| Isorheediaxanthone B | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| Itomanallene A | Organic compounds | Organoheterocyclic compounds | Tetrahydrofurans | Not Available | Details |
| Kalasinamide | Organic compounds | Organoheterocyclic compounds | Quinolines and derivatives | Benzoquinolines | Details |
| (-)-Khekadaengoside B | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Steroidal glycosides | Details |
| (-)-Kleinioxanthrone 2 | Organic compounds | Benzenoids | Anthracenes | Not Available | Details |
| Knightolamine | Organic compounds | Benzenoids | Benzene and substituted derivatives | Benzoic acids and derivatives | Details |
| (+)-Knightoline | Organic compounds | Organoheterocyclic compounds | Piperidines | Benzylpiperidines | Details |
| (+)-Kuhistanicaol D | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Sesquiterpenoids | Details |
| (+)-Kuhistanicaol E | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Sesquiterpenoids | Details |
| Lancifolide | Organic compounds | Organoheterocyclic compounds | Oxolanes | Not Available | Details |
| (+)-Laxanthone I | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| Laxanthone III | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| Litsenolide C1 | Organic compounds | Organoheterocyclic compounds | Lactones | Gamma butyrolactones | Details |
| Ludartin | Organic compounds | Organoheterocyclic compounds | Oxanes | Not Available | Details |
| Luotonin D | Organic compounds | Alkaloids and derivatives | Indolonaphthyridine alkaloids | Not Available | Details |
| Lycopanerol F | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Sesquaterpenoids | Details |
| Lycopanerol G | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Sesquaterpenoids | Details |
| Macrocalin B | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Diterpenoids | Details |
| (+)-Malacitanolide | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Terpene lactones | Details |
| Manglexanthone | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| (-)-Markhamioside E | Organic compounds | Phenylpropanoids and polyketides | Cinnamic acids and derivatives | Hydroxycinnamic acids and derivatives | Details |
| (-)-Markhamioside F | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Marmin | Organic compounds | Phenylpropanoids and polyketides | Coumarins and derivatives | Not Available | Details |
| Merguenone | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| (methylthio-methyl)sulfone | Organic compounds | Benzenoids | Benzene and substituted derivatives | Benzenesulfonyl compounds | Details |
| Miliusate | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbonyl compounds | Details |
| Montrouxanthone | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| (-)-Morusignin G | Organic compounds | Organoheterocyclic compounds | Benzopyrans | 1-benzopyrans | Details |
| (-)-Mulinenic acid | Organic compounds | Organoheterocyclic compounds | Oxanes | Not Available | Details |
