单词	tetracyclic
释义	tetracyclic /ˌtɛtrəˈsʌɪklɪk / /ˌtɛtrəˈsɪklɪk/ adjective Chemistry (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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