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Updated: Jun 6, 2026

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
Published on: February 9, 2021
6,7-seco-ent-kaurane diterpenoids from Isodon sculponeatus with cytotoxic activity
Xian Li1, Jian-Xin Pu, Zhi-Ying Weng
1Kunming Institute of Botany, Chinese Academy of Sciences, P R China.
Abstract:
Six new 6,7-seco-ent-kaurane diterpenoids, sculponeatins N-S (1-6, resp.), together with eleven known analogues, 7-17, were isolated from the aerial parts of Isodon sculponeatus. The structures of compounds 1-6 were elucidated by spectroscopic methods including extensive 1D- and 2D-NMR experiments, as well as HR-ESI-MS analysis. All diterpenoids obtained were assayed for their cytotoxic activity against K562 and HepG2 human tumor cell lines. Among them, compound 1 showed the most significant cytotoxicity with the IC₅₀ values of 0.21 and 0.29 μM, respectively. The structure-activity relationships are discussed.
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