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- W2898047492 abstract "Several N-substituted-3-acyl-2, 5-dimethyl pyrrole derivatives were examined for their potency to inhibit aggregation of platelets in vitro and extra vivo in guinea pigs. A structure-activity relationship study showed that the substitution at 3 position of the pyrrole ring affected in vitro activity of inhibiting platelet aggregation. Compounds with 3-benzoyl or 3-thenoyl substituent had greater potency than those with 3-aliphatic acyl substituent. Modification of benzoyl, such as para substitution of phenyl group or reduction of carbonyl group, decreased the activity. There was no clear correlation between that N-substitution of the pyrrole ring and in vitro anti-platelet activity. However, compounds with a longer alkyl chain in the N-substituent had weaker activity. The in vitro inhibitory activity on prostaglandin synthetase of these compounds, though less potent compared with their antiplatelet activity, has a close correlation with the latter. N-substituents of the pyrrole ring had the effect on extra vivo activity. Compounds which have no N-alpha-methyl group and no hetero atoms such as oxygen or sulfur in the N-substituent diminished the extra vivo activity." @default.
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- W2898047492 date "1980-01-01" @default.
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- W2898047492 title "Structure-activity relationships of novel 3-acylpyrrole derivatives: New inhibitors of platelet aggregation." @default.
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