Ternstroenols A - E: Undescribed pentacyclic triterpenoids from the Australian rainforest plant Ternstroemia cherryi

Chromatographic separation of the extracts of the Australian rainforest plant Ternstroemia cherryi led to the isolation of five undescribed barrigenol-like triterpenoids, ternstroenols A - E, from the fruits and three known ones from the leaves. Ternstroenols A - E represent a new form of structural diversity, being the first in its kind to incorporate a trans- 2, 4, 6- decatrienoyl moiety at C-22. The structures of the ternstroenols were assigned by detailed spectroscopic analysis, degradation and chemical derivatization. All compounds exhibited potent anti-inflammatory activity in LPS and IFN- γ activated RAW 264.7 macrophages, with IC₅₀ values as low as 0.7 μM. Despite the remarkable potency, high levels of unwanted cell growth inhibition was also observed, which prompted their cytotoxic evaluation in U87/U251 human glioblastoma cell lines.