| The major categories are alkylating agents, antimetabolites, plant alkaloids, anti-tumor antibiotics, and steroid hormones. |
| Caffeine is a naturally occurring drug belonging to a group of compounds called alkaloids. |
| Plant or vinca alkaloids are derived from plants and block cell division during mitosis. |
| Benzylisoquinoline alkaloids are ubiquitous among the Papaveraceae, which include the California poppy and the opium poppy. |
| Nicotine and tropane alkaloids are formed in the roots and transported to the aerial parts of the plant. |
| The major compounds extracted by water were amino acids, peptides, saponins, phenol glycosides, tannins, and alkaloids. |
