The problem of discovering powerful and also safe medicinal preparations which efficiently prevent various kinds of pain has not lost its urgency in the course of mankind’s history. In a study of the biological activity of 1-allyl-4-hydroxy-6,7-dimethoxy-2-oxo-1,2-dihydroquinoline-3-carboxylic acid (dialkylamino)-alkylamide hydrochlorides it was found that, depending on the structure of the amide part of the molecule, these compounds can either show opioid receptor antagonist properties or prove to have a totally opposite effect which marked prolongs the analgesic effect of narcotic analgesics [2]. This observation served as the grounds for carrying out a broader study of a targeted search for 4-hydroxyquinol-2-one substances with a novel form of pharmacological activity on the living organism for this class of compound, viz. as potential analgesics.