Molecular structure–biological activity relationships on the basis of quantum‐chemical calculations

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<jats:title>Abstract</jats:title><jats:p>Detailed quantum‐chemical calculations by means of semiempirical all‐valence electrons methods and a generalized (multivariable) rank correlation analysis are the fundamentals of a novel strategy of search for <jats:sc>QSAR</jats:sc> within homologous series of compounds. The set of molecular parameters (describing the electronic and conformational properties as well as potential interactions of the drugs) is calculated theoretically. Owing to the rank correlation method, no linear model (like <jats:sc>LFER</jats:sc>) for the dependence of the biological activity upon the molecular parameters is presumed. The computed correlation coefficients are valued by carefully determined levels of statistical significance. Significant correlations are used to predict unknown activities in terms of ranks relative to the basic sample.</jats:p>

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