Quantitative structure-activity relationships between hydroxamic acids and their urease inhibitory potency.

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Abstract
Quantitative structure activity relationships between physico-chemical properties of four series of > 60 hydroxamic acids [R-(CONHCH2)n-CONHOH, R = aromatic or alphatic, n = 1 or 0) and their urease inhibitory activities were examined. The best improved regression equation primarily indicated that the inhibitory activities of hydroxamic acids were parabolically varied with the hydrophobic variable, .pi. of the R moiety and the optimal .pi. value was calculated to be 2.58. The inhibitory activities of congeners were significantly affected by the B1 variable representing the minimum width of steric size of the R moiety. It was clarified by using 2 indicator variables that inhibitory activities were not affected by the R moiety, whether aromatic or aliphatic, but positively affected by the presence of the -CONHCH2-group between the R moiety and the hydroxamic acid group.