A version of a logical combinatorial intellectual system (DMS system) has been developed to predict the toxicity and hazards of chemical substances. The system is based on the combined description of the substances, which includes both structural and numerical descriptors, particularly those characterizing the reactivity of compounds or their metabolites. The selection of numerical descriptors is based on the classification of processes of the interaction of the substance with the body in accordance with the key stage of the mechanism responsible for its toxic action. The new version of the DSM system takes into account the fact that the toxicity and hazard of chemicals are frequently determined by their bioactivation. Examples of how to apply the system to the prediction of carcinogenicity are given.
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