Quantitative measures of similarity between pharmacologically active compounds

This is the authors' abstract. We don't add key points for this paper.

A theoretical measure of molecular similarity based on ab initio computations of electron density derived from molecular orbital wave functions is first applied to a model series (CH3CH2CH3, CH3OCH3, and CH3SCH3) and then to the rings in a series of prostaglandins and to some histamine H2 antagonists. Comparison in terms of valence electron density seems to be a good basis for structure‐activity studies.