A compound of the formula I, wherein R 1 and R 2 are independently of each other selected from the series consisting of (C 1 -C 6)-alkyl, (C 3 -C 7)-cycloalkyl, (C 3 -C 7)-cycloalkyl-(C 1 -C 4)-alkyl-, Ar and Ar-(C 1 -C 4)-alkyl-; R 3 and R 4 are independently of each other selected from the series consisting of hydrogen, halogen, (C 1 -C 4)-alkyl, (C 3 -C 7)-cycloalkyl, (C 3 -C 7)-cycloalkyl-(C 1 -C 4)-alkyl-, Ar and Ar-(C 1 -C 4)-alkyl-; R 5 and R 6 are independently of each other selected from the series consisting of hydrogen, fluorine and (C 1 -C 6)-alkyl, or R 5 and R 6 together with the carbon atom carrying them form a (C 3 -C 7)-cycloalkane ring which is unsubstituted or substituted by one or more identical or different substituents selected from the series consisting of fluorine and (C 1 -C 4)-alkyl; R 11, R 12, R 13 and R 14 are independently of each other selected from the series consisting of hydrogen and (C 1 -C 4)-alkyl; Ar is selected from the series consisting of phenyl, naphthyl and an aromatic, 5-membered or 6-membered, monocyclic heterocycle which comprises one or two identical or different ring heteroatoms selected from N, O and S, which are all unsubstituted or substituted by one or more identical or different substituents selected from the series consisting of halogen, (C 1 -C 4)-alkyl, (C 3 -C 7)-cycloalkyl, (C 3 -C 7)-cycloalkyl-(C 1 -C 4)-alkyl-, cyano and (C 1 -C 4)-alkyl-O-; V is selected from the series consisting of R 11 -O- and R 12 -N(R 13)-, and G and M are not present, or V is selected from the series consisting of -N(R 14)-, -N(R 14)-(C 1 -C 4)-alkyl-, -O- and -O-(C 1 -C 4)-alkyl-, and G is selected from the series consisting of a direct bond and phenylene which is unsubstituted or substituted by one or more identical or different substituents selected from the series consisting of halogen, (C 1 -C 4)-alkyl, cyano and (C 1 -C 4)-alkyl-O-, provided that G is not a direct bond if V is -N(R 14)- or -O-, and M is selected from the series consisting of R 11 -O-C - and R 12 -N(R 13)-C -; wherein all alkyl groups are unsubstituted or substituted by one or more fluorine substituents, and all cycloalkyl groups are unsubstituted or substituted by one or more identical or different substituents selected from the series consisting of fluorine and (C 1 -C 4)-alkyl; in any of its stereoisomeric forms or a mixture of stereoisomeric forms in any ratio, or a pharmaceutically acceptable salt thereof. R 1 and R 2 are independently of each other selected from the series consisting of (C 1 -C 6)-alkyl, (C 3 -C 7)-cycloalkyl, (C 3 -C 7)-cycloalkyl-(C 1 -C 4)-alkyl-, Ar and Ar-(C 1 -C 4)-alkyl-; R 3 and R 4 are independently of each other selected from the series consisting of hydrogen, halogen, (C 1 -C 4)-alkyl, (C 3 -C 7)-cycloalkyl, (C 3 -C 7)-cycloalkyl-(C 1 -C 4)-alkyl-, Ar and Ar-(C 1 -C 4)-alkyl-; R 5 and R 6 are independently of each other selected from the series consisting of hydrogen, fluorine and (C 1 -C 6)-alkyl, or R 5 and R 6 together with the carbon atom carrying them form a (C 3 -C 7)-cycloalkane ring which is unsubstituted or substituted by one or more identical or different substituents selected from the series consisting of fluorine and (C 1 -C 4)-alkyl; R 11, R 12, R 13 and R 14 are independently of each other selected from the series consisting of hydrogen and (C 1 -C 4)-alkyl; Ar is selected from the series consisting of phenyl, naphthyl and an aromatic, 5-membered or 6-membered, monocyclic heterocycle which comprises one or two identical or different ring heteroatoms selected from N, O and S, which are all unsubstituted or substituted by one or more identical or different substituents selected from the series consisting of halogen, (C 1 -C 4)-alkyl, (C 3 -C 7)-cycloalkyl, (C 3 -C 7)-cycloalkyl-(C 1 -C 4)-alkyl-, cyano and (C 1 -C 4)-alkyl-O-; V is selected from the series consisting of R 11 -O- and R 12 -N(R 13)-, and G and M are not present, or V is selected from the series consisting of -N(R 14)-, -N(R 14)-(C 1 -C 4)-alkyl-, -O- and -O-(C 1 -C 4)-alkyl-, and G is selected from the series consisting of a direct bond and phenylene which is unsubstituted or substituted by one or more identical or different substituents selected from the series consisting of halogen, (C 1 -C 4)-alkyl, cyano and (C 1 -C 4)-alkyl-O-, provided that G is not a direct bond if V is -N(R 14)- or -O-, and M is selected from the series consisting of R 11 -O-C - and R 12 -N(R 13)-C -;