(Of a compound) having a molecular structure of four fused hydrocarbon rings.
- Cucurbitacins are oxygenated tetracyclic triterpenes that have been shown to have emetic, antineoplastic, and cytotoxic effects on herbivores, resulting in feeding and oviposition deterrence and reduced growth of consumers.
- A 1998 study showed that pentacyclic alkaloids weakly activated human B- and T-lymphocytes, and that tetracyclic oxindole alkaloids reduced the activity of pentacyclic oxindoles.
- Mirtazapine is a tetracyclic antidepressant unrelated to tricyclic antidepressants and SSRIs.
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