| 1. | Introduction |
| 2. | Alkaloids Derived from Polyketides and the Amino Acids Ornithine and Lysine |
| 2.1. | Alkaloids Derived by the Insertion of Nitrogen into a Polyketide |
| 2.1.1. | (S)-(+)-Coniine,  -Coniceine and Related Alkaloids |
| 2.1.2. | Solenopsin Family (Fire Ant Alkaloids) |
| 2.1.3. | Perhydroazaphenalenes: Defensive Alkaloids of the Coccinellidae |
| 2.1.4. | Cyanobacteria Alkaloids |
| 2.1.5. | Additional Polyketide-Derived Alkaloids |
| 2.2. | Alkaloids Derived from Ornithine and/or Arginine |
| 2.2.1. | Tropane Alkaloids |
| 2.2.2. | Pyrrolizidine Alkaloids |
| 2.3. | Alkaloids Derived from Ornithine (and/or Arginine) and Nicotinic Acid |
| 2.4. | Alkaloids Derived from Lysine (Lys, K) and Nicotinic Acid |
| 2.5. | Purine Alkaloids |
| 2.6. | Imidazole Alkaloids |
| 2.7. | Pepper Alkaloids |
| 3. | Alkaloids Derived from the Shikimate Pathway |
| 3.1. | Alkaloids Derived from Anthranilate |
| 3.2. | Alkaloids Derived from Phenylalanine and Tyrosine |
| 3.2.1. | Biosynthesis of Dopamine, Mescaline and Capsaicin |
| 3.2.2. | Biosynthesis of Tetrahydroisoquinoline Alkaloids |
| 3.2.3. | Cryptostyline (Orchidaceae) and Alkaloids of the Amaryllidaceae |
| 3.2.4. | Ephedra Alkaloids |
| 3.3. | Alkaloids Derived from Tyrosine |
| 3.4. | Alkaloids Derived from Tryptophan and/or Tryptamine (Indole Alkaloids) |
| 3.4.1. | Alkaloids Derived from Tryptamine and an Unrearranged Monoterpene Unit |
| 3.4.2. | Mold Metabolites |
| 3.4.3. | Ergot Alkaloids |
| 3.4.4. | Corynantheine–Heteroyohimbine Structural Types |
| 3.4.5. | Corynantheine-Type Alkaloids |
| 3.4.6. | Ajmalicine-Type Alkaloids |
| 3.4.7. | Heteroyohimbine Oxindole Type |
| 3.4.8. | Glucoalkaloids |
| 3.4.9. | Yohimbine–Reserpine Structural Types |
| 3.4.10. | Akuammidine–Quebrachidine–Ervatamine–Gelsemine–Akuammiline Structural Types |
| 3.4.11. | Uleine–Ellipticine–Vallesamine–Ngouniensine Structural Types |
| 3.5. | The Cinchona Structural Type |
| 3.6. | The Camptothecin Structural Type |
| 3.7. | Terpene, Sesquiterpene, Diterpene and Steroidal Alkaloids ( ((anchor interlink a26_205.xml Terpenes))) |
| 3.7.1. | Overview of Terpenoid Biosynthesis |
| 3.7.2. | Monoterpene Alkaloids |
| 3.7.3. | Sesquiterpene Alkaloids |
| 3.7.4. | Diterpene Alkaloids |
| 3.7.5. | Sesterterpene and Triterpene Alkaloids |
| 3.7.6. | Steroidal Alkaloids |
| 4. | Summary |
