A compound of formula in which: A represents a bond or a -CH 2 - or a -(CH 2) 2 - group, and R 5 represents a group selected from: -C OH, -C(=O)OR 12, HOC(=O)-(C 1 -C 6 -alkyl)-, R 12 OC(=O)-(C 1 -C 6 -alkyl)-, HOC(=O)-(C 2 -C 6 -alkenyl)-, R 12 OC(=O)-(C 2 -C 6 -alkenyl)-, HOC(=O)-(C 1 -C 6 -alkoxy)-, R 12 OC(=O)-(C 1 -C 6 -alkoxy)-, -C(=O)N(R 13)R 14, R 13 (R 14)NC(=O)-(C 1 -C 6 -alkyl)-, R 13 (R 14)NC(=O)-(C 2 -C 6 -alkenyl)-, R 13 (R 14)NC(=O)-(C 1 -C 6 -alkoxy)- and cyano; or A represents a -CH(CH 3)- or a -C(CH 3) 2 - group, and R 5 represents a group selected from: -C(=O)OH, HOC(=O)-(C 1 -C 6 -alkyl)-, R 12 OC(=O)-(C 1 -C 6 -alkyl)-, HOC(=O)-(C 2 -C 6 -alkenyl)-, R 12 OC(=O)-(C 2 -C 6 -alkenyl)-, HOC(=O)-(C 1 -C 6 -alkoxy)-, R 12 OC(=O)-(C 1 -C 6 -alkoxy)-, -C(=O)N(R 13)R 14, R 13 (R 14)NC(=O)-(C 1 -C 6 -alkyl)-, R 13 (R 14)NC(=O)-(C 2 -C 6 -alkenyl)-, R 13 (R 14)NC(=O)-(C 1 -C 6 -alkoxy)- and cyano; R 1 represents a phenyl group or a 5-, 6- or 9-membered heteroaryl group, which phenyl group is optionally substituted with one, two or three substituents, which are, independently of each other, a halogen atom or a group selected from: C 1 -C 6 -alkyl, C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkoxy, C 3 -C 6 -cycloalkyloxy, C 1 -C 6 -haloalkyl, C 1 -C 6 -haloalkoxy and cyano; and which heteroaryl group is optionally substituted with one, two or three substituents, which are, independently of each other, a halogen atom or a group selected from: C 1 -C 3 -alkyl and phenyl; R 4 represents a hydrogen atom or a halogen atom; R 6 represents a hydrogen atom or a halogen atom or a group selected from: C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 3 -C 6 -cycloalkyl, C 3 -C 6 -cycloalkyloxy, C 1 -C 6 -haloalkyl, C 1 -C 6 -haloalkoxy and cyano; R 7 represents a hydrogen atom; R 8 represents a C 1 -C 3 -alkyl group; R 9, R 10, and R 11 are independently of each other selected from: hydrogen and C 1 -C 3 -alkyl; R 12 represents a group selected from: C 1 -C 6 -alkyl and C 3 -C 6 -cycloalkyl; R 13 and R 14 are independently of each other selected from: hydrogen and C 1 -C 6 -alkyl; or R 13 and R 14 together with the nitrogen atom to which they are attached form a 4- to 6-membered heterocycloalkyl group; said 4- to 6-membered heterocycloalkyl group being optionally substituted with one substituent selected from: C 1 -C 3 -alkyl, C 1 -C 3 -haloalkyl, C 1 -C 3 -alkoxy, C 1 -C 3 -haloalkoxy, amino, hydroxy, halogen and cyano; or said 4- to 6-membered heterocycloalkyl group being optionally substituted with two halogen atoms; or a stereoisomer, a tautomer, an N-oxide, a hydrate, a solvate, a salt thereof, or a mixture of same. A represents a bond or a -CH 2 - or a -(CH 2) 2 - group, and R 5 represents a group selected from: -C OH, -C(=O)OR 12, HOC(=O)-(C 1 -C 6 -alkyl)-, R 12 OC(=O)-(C 1 -C 6 -alkyl)-, HOC(=O)-(C 2 -C 6 -alkenyl)-, R 12 OC(=O)-(C 2 -C 6 -alkenyl)-, HOC(=O)-(C 1 -C 6 -alkoxy)-, R 12 OC(=O)-(C 1 -C 6 -alkoxy)-, -C(=O)N(R 13)R 14, R 13 (R 14)NC(=O)-(C 1 -C 6 -alkyl)-, R 13 (R 14)NC(=O)-(C 2 -C 6 -alkenyl)-, R 13 (R 14)NC(=O)-(C 1 -C 6 -alkoxy)- and cyano; or A represents a -CH(CH 3)- or a -C(CH 3) 2 - group, and R 5 represents a group selected from: -C(=O)OH, HOC(=O)-(C 1 -C 6 -alkyl)-, R 12 OC(=O)-(C 1 -C 6 -alkyl)-, HOC(=O)-(C 2 -C 6 -alkenyl)-, R 12 OC(=O)-(C 2 -C 6 -alkenyl)-, HOC(=O)-(C 1 -C 6 -alkoxy)-, R 12 OC(=O)-(C 1 -C 6 -alkoxy)-, -C(=O)N(R 13)R 14, R 13 (R 14)NC(=O)-(C 1 -C 6 -alkyl)-, R 13 (R 14)NC(=O)-(C 2 -C 6 -alkenyl)-, R 13 (R 14)NC(=O)-(C 1 -C 6 -alkoxy)- and cyano; R 1 represents a phenyl group or a 5-, 6- or 9-membered heteroaryl group, which phenyl group is optionally substituted with one, two or three substituents, which are, independently of each other, a halogen atom or a group selected from: C 1 -C 6 -alkyl, C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkoxy, C 3 -C 6 -cycloalkyloxy, C 1 -C 6 -haloalkyl, C 1 -C 6 -haloalkoxy and cyano; and which heteroaryl group is optionally substituted with one, two or three substituents, which are, independently of each other, a halogen atom or a group selected from: C 1 -C 3 -alkyl and phenyl; C 1 -C 6 -alkyl, C 3 -C 6 -cycloalkyl, C 1 -C 6 -alkoxy, C 3 -C 6 -cycloalkyloxy, C 1 -C 6 -haloalkyl, C 1 -C 6 -haloalkoxy and cyano; and which heteroaryl group is optionally substituted with one, two or three substituents, which are, independently of each other, a halogen atom or a group selected from: C 1 -C 3 -alkyl and phenyl; R 4 represents a hydrogen atom or a halogen atom; R 6 represents a hydrogen atom or a halogen atom or a group selected from: C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 3 -C 6 -cycloalkyl, C 3 -C 6 -cycloalkyloxy, C 1 -C 6 -haloalkyl, C 1 -C 6 -haloalkoxy and cyano; R 7 represents a hydrogen atom; R 8 represents a C 1 -C 3 -alkyl group; R 9, R 10, and R 11 are independently of each other selected from: hydrogen and C 1 -C 3 -alkyl; R 12 represents a group selected from: C 1 -C 6 -alkyl and C 3 -C 6 -cycloalkyl; R 13 and R 14 are independently of each other selected from: hydrogen and C 1 -C 6 -alkyl; or R 13 and R 14 together with the nitrogen atom to which they are attached form a 4- to 6-membered heterocycloalkyl group; said 4- to 6-membered heterocycloalkyl group being optionally substituted with one substituent selected from: C 1 -C 3 -alkyl, C 1 -C 3 -haloalkyl, C 1 -C 3 -alkoxy, C 1 -C 3 -haloalkoxy, amino, hydroxy, halogen and cyano; or said 4- to 6-membered heterocycloalkyl group being optionally substituted with two halogen atoms;