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As part of our studies to discover P2X 7 receptor antagonists, the sponge Callyspongia sp. was investigated. A new tripyridine alkaloid niphatoxin C ( 1) was isolated and had P2X 7 receptor antagonism; however, cytotoxicity of THP-1 cells was the predominant biological effect at higher concentrations. Its structure was determined by 1- and 2-D NMR spectroscopy.
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Buchanan et al. (2007) studied this question.
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