Abstract
Two novel bis-labdanic diterpenoids named calcaratarin D and calcaratarin E were isolated from the rhizomes of Alpinia calcarata. Their structures were elucidated as a pair of stereoisomers on the basis of the spectral evidence. 2D NMR techniques including (1)H- (1)H COSY, HMQC, HMBC, NOESY spectra and HRFABMS were extensively applied to establish the structures. The two bis-labdanic diterpenoids showed cytotoxic activity against human KB cells in vitro.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Alpinia*
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Antineoplastic Agents, Phytogenic / chemistry
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Antineoplastic Agents, Phytogenic / pharmacology*
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Cell Division / drug effects
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Diterpenes / chemistry
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Diterpenes / pharmacology*
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Humans
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Inhibitory Concentration 50
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KB Cells
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Magnetic Resonance Spectroscopy
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Molecular Structure
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Plant Extracts / pharmacology
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Stereoisomerism
Substances
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Antineoplastic Agents, Phytogenic
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Diterpenes
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Plant Extracts
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calcaratarin D
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calcaratarin E
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labdane