Mianserin hydrochloride (Org GB 94) is a tetracyclic compound with antidepressant effects. it apparently blocks alpha-adrenergic, histamine H1, and some types of serotonin receptors. It may cause drowsiness and hematological problems.

Cucurbitacin Q1, a compound isolated from the fruit of Cucumis prophetarum, has been shown to be the pure trans component of cucurbitacin Q.

Tirucallol is an antiinflammatory agent isolated from Euphorbia lactea.Tirucallol exerts a topical anti-inflammatory effect in vivo, via a mechanism of action related to the neutrophil migration.

Lanosterol (3β-Hydroxy-8,24-lanostadiene) is a tetracyclic triterpenoid which is the compound from which all steroids are derived.

4-Deoxy-4α-phorbol, a tetracyclic diterpene identified in E. desmondi, serves as a precursor in the semisynthesis of compounds inhibiting HIV-1-induced cytopathic effects in MT-4 cells and the creation of 4α-phorbol esters.

Isosteviol ((-)-Isosteviol), a common natural sweetener, belongs to tetracyclic diterpene glycosides. The pharmacology researches have suggested that stevioside and its hydrolysis products, steviol, isosteviol and steviolbioside, have many biological activities, such as reducing blood glucose, lowering blood pressure, anti-inflammation, anti-tumor, anti-diarrhea, antibacterium, immunoregulation, etc.

Polyketomycin is a tetracyclic quinone glycoside antibiotic isolated from Streptomyces sp. or Streptomyces diastatochromogenes, has antibacterial, anticancer, antimalarial activities.

Ganoderiol A is a tetracyclic triterpene extracted from Ganoderma amboinense.

Corynoxine is a tetracyclic oxindole alkaloid isolated from Uncaria macrophylla. It is an autophagy enhancer that promotes α-synuclein clearance through the Akt/mTOR pathway.

Corynoxine hydrochloride, a tetracyclic oxindole alkaloid extracted from the hooks of Uncaria macrophylla, functions as a natural autophagy enhancer. It facilitates the removal of alpha-synuclein by activating the Akt/mTOR pathway [1].

Euphol, an alcohol tetracyclic triterpene, has a wide range of pharmacological properties and is considered to have anti-inflammatory action.

1. Ganoderic acid D is one of the major components in Ganoderma triterpenes. 2. Ganoderic acid D treatment for 48h inhibits the proliferation of HeLa human cervical carcinoma cells with an IC(5) value of 17.3 +/- .3 microM.