Compound of the formula in which R 1 represents a heteroaryl group of the formula wherein * denotes the linkage point with the dihydropyrazolone ring, and R 4 denotes hydrogen, fluorine, chlorine, bromine, cyano, (C 1 -C 4)-alkyl, trifluoromethyl, hydroxymethyl, (C 1 -C 4)-alkoxy, trifluoromethoxy, hydroxycarbonyl or (C 1 -C 4)-alkoxycarbonyl, R 2 represents a heteroaryl group of the formula wherein # denotes the linkage point with the dihydropyrazolone ring, and R 6, R 6A and R 6B are identical or different and, independently of one another,denote hydrogen or a substituent chosen from the series consisting of fluorine, chlorine, bromine, cyano, (C 1 -C 6)-alkyl, trifluoromethyl, hydroxyl, (C 1 -C 6)-alkoxy, trifluoromethoxy, amino, mono-(C 1 -C 4) -alkylamino, di-(C 1 -C 4)-alkylamino, hydroxycarbonyl, (C 1 -C 4)-alkoxycarbonyl and 4- to 6-membered heterocycloalkyl, where (C 1 -C 6) -alkyl for its part may be substituted by hydroxyl, (C 1 -C 4)-alkoxy or amino, and 4- to 6-membered heterocycloalkyl for its part may be substituted once or twice in an identical or different manner by fluorine, cyano, (C 1 -C 4) -alkyl, trifluoromethyl, hydroxyl, (C 1 -C 4)-alkoxy, oxo, amino, mono-(C 1 -C 4)-alkyl-amino, di-(C 1 -C 4)-alkylamino, hydroxy-carbonyl and/or (C 1 -C 4)-alkoxycarbonyl, and R 3 represents hydrogen, and its salts, solvates and solvates of the salts. R 1 represents a heteroaryl group of the formula wherein * denotes the linkage point with the dihydropyrazolone ring, and R 4 denotes hydrogen, fluorine, chlorine, bromine, cyano, (C 1 -C 4)-alkyl, trifluoromethyl, hydroxymethyl, (C 1 -C 4)-alkoxy, trifluoromethoxy, hydroxycarbonyl or (C 1 -C 4)-alkoxycarbonyl, * denotes the linkage point with the dihydropyrazolone ring, and R 4 denotes hydrogen, fluorine, chlorine, bromine, cyano, (C 1 -C 4)-alkyl, trifluoromethyl, hydroxymethyl, (C 1 -C 4)-alkoxy, trifluoromethoxy, hydroxycarbonyl or (C 1 -C 4)-alkoxycarbonyl, R 2 represents a heteroaryl group of the formula wherein # denotes the linkage point with the dihydropyrazolone ring, and R 6, R 6A and R 6B are identical or different and, independently of one another,denote hydrogen or a substituent chosen from the series consisting of fluorine, chlorine, bromine, cyano, (C 1 -C 6)-alkyl, trifluoromethyl, hydroxyl, (C 1 -C 6)-alkoxy, trifluoromethoxy, amino, mono-(C 1 -C 4) -alkylamino, di-(C 1 -C 4)-alkylamino, hydroxycarbonyl, (C 1 -C 4)-alkoxycarbonyl and 4- to 6-membered heterocycloalkyl, where (C 1 -C 6) -alkyl for its part may be substituted by hydroxyl, (C 1 -C 4)-alkoxy or amino, and 4- to 6-membered heterocycloalkyl for its part may be substituted once or twice in an identical or different manner by fluorine, cyano, (C 1 -C 4) -alkyl, trifluoromethyl, hydroxyl, (C 1 -C 4)-alkoxy, oxo, amino, mono-(C 1 -C 4)-alkyl-amino, di-(C 1 -C 4)-alkylamino, hydroxy-carbonyl and/or (C 1 -C 4)-alkoxycarbonyl, and # denotes the linkage point with the dihydropyrazolone ring, and R 6, R 6A and R 6B are identical or different and, independently of one another,denote hydrogen or a substituent chosen from the series consisting of fluorine, chlorine, bromine, cyano, (C 1 -C 6)-alkyl, trifluoromethyl, hydroxyl, (C 1 -C 6)-alkoxy, trifluoromethoxy, amino, mono-(C 1 -C 4) -alkylamino, di-(C 1 -C 4)-alkylamino, hydroxycarbonyl, (C 1 -C 4)-alkoxycarbonyl and 4- to 6-membered heterocycloalkyl, where (C 1 -C 6) -alkyl for its part may be substituted by hydroxyl, (C 1 -C 4)-alkoxy or amino, and 4- to 6-membered heterocycloalkyl for its part may be substituted once or twice in an identical or different manner by fluorine, cyano, (C 1 -C 4) -alkyl, trifluoromethyl, hydroxyl, (C 1 -C 4)-alkoxy, oxo, amino, mono-(C 1 -C 4)-alkyl-amino, di-(C 1 -C 4)-alkylamino, hydroxy-carbonyl and/or (C 1 -C 4)-alkoxycarbonyl, R 3 represents hydrogen,