Phenanthridines

Lycorine is a toxic crystalline alkaloid found in various Amaryllidaceae species, such as the cultivated bush lily (Clivia miniata), surprise lilies (Lycoris), and daffodils (Narcissus). It may be highly poisonous, or even lethal, when ingested in certain quantities. Regardless, it is sometimes used medicinally, a reason why some groups may harvest the very popular Clivia miniata.

Phenanthridine is a nitrogen heterocyclic compound with the formula . It is a colorless solid, although impure samples can be brownish. It is a precursor to DNA-binding fluorescent dyes through intercalation. Examples of such dyes are ethidium bromide and propidium iodide. Phenanthridine was discovered by Amé Pictet and H. J. Ankersmit in 1891.

Levonantradol (CP 50,556-1) is a synthetic cannabinoid analog of dronabinol (Marinol) developed by Pfizer in the 1980s. It is around 30 times more potent than THC, and exhibits antiemetic and analgesic effects via activation of CB1 and CB2 cannabinoid receptors. Levonantradol is not currently used in medicine as dronabinol or nabilone are felt to be more useful for most conditions, however it is widely used in research into the potential therapeutic applications of cannabinoids.