Compound of the formula in which R 1 is a group of the formula where * is the attachment point to the oxopyridine ring, R 6 is bromine, chlorine, fluorine, methyl, difluoromethyl, trifluoromethyl, methoxy, difluoromethoxy or trifluoromethoxy, R 7 is bromine, chlorine, fluorine, cyano, nitro, hydroxyl, methyl, difluoromethyl, trifluoromethyl, methoxy, ethoxy, difluoromethoxy, trifluoromethoxy, ethynyl, 3,3,3-trifluoroprop-1-yn-1-yl or cyclopropyl, R 8 is hydrogen, chlorine or fluorine, R 2 is hydrogen, bromine, chlorine, fluorine, cyano, C 1 -C 3 -alkyl, difluoromethyl, trifluoromethyl, 1,1-difluoroethyl, 2,2-difluoroethyl, 2,2,2-trifluoroethyl, C 1 -C 3 -alkoxy, difluoromethoxy, trifluoromethoxy, 1,1-difluoroethoxy, 2,2-difluoroethoxy, 2,2,2-trifluoroethoxy, methylcarbonyl or cyclopropyl, R 3 is hydrogen, C 1 -C 5 -alkyl, C 1 -C 4 -alkoxy, difluoromethyl, trifluoromethyl, 1,1-difluoroethyl, 1,1,2,2,2-pentadeuteroethyl, 3,3,3-trifluoro-2-hydroxyprop-1-yl, 3,3,3-trifluoro-2-methoxyprop-1-yl, 3,3,3-trifluoro-2-ethoxyprop-1-yl, prop-2-yn-1-yl, cyclopropyloxy or cyclobutyloxy, where alkyl may be substituted by a substituent selected from the group consisting of fluorine, cyano, hydroxyl, difluoromethyl, trifluoromethyl, methoxy, ethoxy, difluoromethoxy, trifluoromethoxy, C 3 -C 6 -cycloalkyl, 4- to 6-membered oxoheterocyclyl, 1,4-dioxanyl, oxazolyl, pyrazolyl, phenyl and pyridyl, in which cycloalkyl may be substituted by 1 to 2 substituents selected independently from the group consisting of fluorine, hydroxyl, methyl, ethyl, methoxy, ethoxy, difluoromethyl, trifluoromethyl, difluoromethoxy and trifluoromethoxy, and in which oxoheterocyclyl may be substituted by 1 to 2 substituents selected independently from the group consisting of oxo, fluorine, methyl, ethyl, difluoromethyl and trifluoromethyl, and in which oxazolyl and pyrazolyl may be substituted by 1 to 2 substituents selected independently from the group consisting of methyl and ethyl, R 4 is hydrogen, R 5 is a group of the formula where # is the attachment point to the nitrogen atom, R 15 is hydrogen or fluorine, R 16 is hydroxyl or -NHR 17, in which R 17 is hydrogen or C 1 -C 4 -alkyl, or one of the salts thereof, solvates thereof or solvates of the salts thereof. R 1 is a group of the formula where * is the attachment point to the oxopyridine ring, R 6 is bromine, chlorine, fluorine, methyl, difluoromethyl, trifluoromethyl, methoxy, difluoromethoxy or trifluoromethoxy, R 7 is bromine, chlorine, fluorine, cyano, nitro, hydroxyl, methyl, difluoromethyl, trifluoromethyl, methoxy, ethoxy, difluoromethoxy, trifluoromethoxy, ethynyl, 3,3,3-trifluoroprop-1-yn-1-yl or cyclopropyl, R 8 is hydrogen, chlorine or fluorine, R 6 is bromine, chlorine, fluorine, methyl, difluoromethyl, trifluoromethyl, methoxy, difluoromethoxy or trifluoromethoxy, R 7 is bromine, chlorine, fluorine, cyano, nitro, hydroxyl, methyl, difluoromethyl, trifluoromethyl, methoxy, ethoxy, difluoromethoxy, trifluoromethoxy, ethynyl, 3,3,3-trifluoroprop-1-yn-1-yl or cyclopropyl, R 8 is hydrogen, chlorine or fluorine, R 2 is hydrogen, bromine, chlorine, fluorine, cyano, C 1 -C 3 -alkyl, difluoromethyl, trifluoromethyl, 1,1-difluoroethyl, 2,2-difluoroethyl, 2,2,2-trifluoroethyl, C 1 -C 3 -alkoxy, difluoromethoxy, trifluoromethoxy, 1,1-difluoroethoxy, 2,2-difluoroethoxy, 2,2,2-trifluoroethoxy, methylcarbonyl or cyclopropyl, R 3 is hydrogen, C 1 -C 5 -alkyl, C 1 -C 4 -alkoxy, difluoromethyl, trifluoromethyl, 1,1-difluoroethyl, 1,1,2,2,2-pentadeuteroethyl, 3,3,3-trifluoro-2-hydroxyprop-1-yl, 3,3,3-trifluoro-2-methoxyprop-1-yl, 3,3,3-trifluoro-2-ethoxyprop-1-yl, prop-2-yn-1-yl, cyclopropyloxy or cyclobutyloxy, where alkyl may be substituted by a substituent selected from the group consisting of fluorine, cyano, hydroxyl, difluoromethyl, trifluoromethyl, methoxy, ethoxy, difluoromethoxy, trifluoromethoxy, C 3 -C 6 -cycloalkyl, 4- to 6-membered oxoheterocyclyl, 1,4-dioxanyl, oxazolyl, pyrazolyl, phenyl and pyridyl, in which cycloalkyl may be substituted by 1 to 2 substituents selected independently from the group consisting of fluorine, hydroxyl, methyl, ethyl, methoxy, ethoxy, difluoromethyl, trifluoromethyl, difluoromethoxy and trifluoromethoxy, and in which oxoheterocyclyl may be substituted by 1 to 2 substituents selected independently from the group consisting of oxo, fluorine, methyl, ethyl, difluoromethyl and trifluoromethyl, and in which oxazolyl and pyrazolyl may be substituted by 1 to 2 substituents selected independently from the group consisting of methyl and ethyl, in which cycloalkyl may be substituted by 1 to 2 substituents selected independently from the group consisting of fluorine, hydroxyl, methyl, ethyl, methoxy, ethoxy, difluoromethyl, trifluoromethyl, difluoromethoxy and trifluoromethoxy, and in which oxoheterocyclyl may be substituted by 1 to 2 substituents selected independently from the group consisting of oxo, fluorine, methyl, ethyl, difluoromethyl and trifluoromethyl, and in which oxazolyl and pyrazolyl may be substituted by 1 to 2 substituents selected independently from the group consisting of methyl and ethyl, R 4 is hydrogen, R 5 is a group of the formula where # is the attachment point to the nitrogen atom, R 15 is hydrogen or fluorine, R 16 is hydroxyl or -NHR 17, in which R 17 is hydrogen or C 1 -C 4 -alkyl, R 15 is hydrogen or fluorine, R 16 is hydroxyl or -NHR 17, in which R 17 is hydrogen or C 1 -C 4 -alkyl, R 17 is hydrogen or C 1 -C 4 -alkyl,