Abstract
From the leaves of Isodon megathyrsus, a novel ent-kaurene diterpene, megathyrin B, was isolated and its structure determined as 1 alpha,7 beta,11 beta,15 beta-tetrahydroxy-ent-7 alpha,20-epoxy-kaur-16-ene by 1D- and 2D-NMR spectral analysis. Additionally, its stereochemistry was unambiguously assigned by X-ray crystallography. This compound was cytotoxic to the KB and KB-V cell lines.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Antineoplastic Agents, Phytogenic / chemistry
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Antineoplastic Agents, Phytogenic / isolation & purification*
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Antineoplastic Agents, Phytogenic / pharmacology
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Astrocytoma / pathology
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Brain Neoplasms / pathology
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Crystallography, X-Ray
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Diterpenes / chemistry
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Diterpenes / isolation & purification*
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Diterpenes / pharmacology
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Drug Screening Assays, Antitumor
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Humans
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Magnetic Resonance Spectroscopy
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Mass Spectrometry
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Mitosis / drug effects
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Molecular Structure
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Plant Leaves / chemistry*
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Tumor Cells, Cultured
Substances
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Antineoplastic Agents, Phytogenic
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Diterpenes
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megathyrin B