title: Calculation of intersubstituent similarity using R-group descriptors.
abstract: This paper discusses the calculation of the similarities between pairs of substituents on ring systems. An R-group descriptor characterizes the distribution of some atom-based property, such as elemental type or partial atomic charge, at increasing numbers of bonds distant from the point of substitution on the parent ring. The similarity between a pair of descriptors is then calculated by a comparison of the corresponding property vectors. Experiments with the BIOSTER database demonstrate the ability of such similarity measures to discriminate between bioisosteric and nonbioisosteric functional groups.
authors.affiliation: Krebs Institute for Biomolecular Research and Department of Information Studies, University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom.
authors.forename: John D
authors.initials: JD
authors.lastname: Holliday
authors.forename: Stephen P
authors.initials: SP
authors.lastname: Jelfs
authors.forename: Peter
authors.initials: P
authors.lastname: Willett
authors.forename: Peter
authors.initials: P
authors.lastname: Gedeck