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Structure-activity correlations for psychotomimetics
Journal article   Peer reviewed

Structure-activity correlations for psychotomimetics

B.W. Clare
Chemometrics and Intelligent Laboratory Systems, Vol.18(1), pp.71-92
1993
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Abstract

A refinement of the quantitative structure-activity relationship presented in Part 1 of this series using the alternating conditional expectations (ACE) technique to account for nonlinearity is described. It is shown that the hydrophobicity interaction effect found in Part 1 is nonlinear in nature, and is a major term in accounting for the activity of phenylalkylamine psychotomimetics. The volume interaction can be accounted for equally by nonlinear behaviour in the remaining terms. Para-group hydrophobicity dependence is nonlinear, confirming the results of Part 1. A receptor site model is postulated. The plausibility of the model is confirmed by a satisfactory prediction of some data which were not used in its construction. The ACE method is tested on synthetic data and a shortcoming of the cross-validation technique is demonstrated. The stepwise use of ACE in selection of variables is shown, at least with this data set, to be unsatisfactory. An alternative method of validating stepwise regression results is presented.

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2 Chemistry
2.123 Protein Stucture, Folding & Modelling
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