Homologous N-alkylnorketobemidones. Correlation of receptor binding with analgesic potency

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Abstract
For a homologous series of N-alkylnorketobemidones a statistically significant correlation was found between the relative abilities to bind mouse brain homogenate in vitro and their in vivo mouse hot-plate analgesic potencies. The correlation between in vitro binding in the presence of 100 mM sodium and analgesic potency was not as good AS THAT as that found in the absence of sodium. A statistically significant correlatin was found between thir analgesic potencies and their abilities to antogonize electrically induced contractions of the guinea pig ileum.

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