A compound of formula I in which R 1 represents phenyl, pyridyl which latter two groups are optionally substituted with one to three groups selected independently of one another from halogen, cyano, nitro, amino, C 1-5 alkyl, C 3-6 cycloalkyl, -O-C 1-5 alkyl, -N( R 5)( R 6), -C N( R 5)( R 6) which latter five groups are optionally substituted with one or more fluorine atoms; R 2 represents a 5-14-membered aryl, 5-14-membered heteroaryl which latter two groups are optionally substituted with 1 to 4 groups selected from -OH, halogen, cyano, 4-9-membered heterocyclyl, C 6-10 aryl, 5-9 membered heteroaryl, C 1-5 alkyl, -C 1-5 alkyl-OH, -O-C 1-5 -alkyl, -O-C 1-5 alkyl-O-C 1-5 -alkyl, -O-C 3-5 alkynyl,-C 1-5 alkyl-O-C 1-5 -alkyl, C 3-7 cycloalkyl, -O-C 3-7 cycloalkyl, -O-CH 2 -C 3-7 -cycloalkyl, C 1-5 alkyl-CO-, -C 1-5 alkyl-N( R 5)( R 6), -N( R 5)( R 6), - S 2 -C 1-5 alkyl which latter sixteen groups -are optionally substituted with one or more fluorine atoms; R 3 and R 4 independently represent hydrogen, C 1-3 alkyl, -C 1-3 alkyl-O-C 1-3 alkyl which latter three groups are optionally substituted with one or more fluorine atoms, with the proviso that R 3 and R 4 both are not hydrogen; or R 3 and R 4 if both are attached to the same carbon atom, they may together with the carbon atom to which they are attached form a ring selected from the group consisting of cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, piperidinyl, tetrahydrofuranyl, tetrahydropyranyl which latter seven groups are optionally substituted with one or more fluorine atoms; R 5 and R 6 independently represent hydrogen, C 1-5 alkyl, benzyl, -C -C 1-5 alkyl, -C -C 1-5 alkyl, -S 2 -C 1-5 alkyl which latter five groups are optionally substituted with one or more fluorine atoms, or R 5 and R 6 together with the nitrogen atom to which they are attached form a 4-6-membered heterocyclyl, piperidinyl, tetrahydrofuranyl or tetrahydropyranyl ring which latter four groups are optionally substituted with one or more fluorine atoms; Q represents CH or N; or a salt thereof, particularly a physiologically acceptable salt thereof. R 1 represents phenyl, pyridyl which latter two groups are optionally substituted with one to three groups selected independently of one another from halogen, cyano, nitro, amino, C 1-5 alkyl, C 3-6 cycloalkyl, -O-C 1-5 alkyl, -N( R 5)( R 6), -C N( R 5)( R 6) which latter five groups are optionally substituted with one or more fluorine atoms; R 2 represents a 5-14-membered aryl, 5-14-membered heteroaryl which latter two groups are optionally substituted with 1 to 4 groups selected from -OH, halogen, cyano, 4-9-membered heterocyclyl, C 6-10 aryl, 5-9 membered heteroaryl, C 1-5 alkyl, -C 1-5 alkyl-OH, -O-C 1-5 -alkyl, -O-C 1-5 alkyl-O-C 1-5 -alkyl, -O-C 3-5 alkynyl,-C 1-5 alkyl-O-C 1-5 -alkyl, C 3-7 cycloalkyl, -O-C 3-7 cycloalkyl, -O-CH 2 -C 3-7 -cycloalkyl, C 1-5 alkyl-CO-, -C 1-5 alkyl-N( R 5)( R 6), -N( R 5)( R 6), - S 2 -C 1-5 alkyl which latter sixteen groups -are optionally substituted with one or more fluorine atoms; R 3 and R 4 independently represent hydrogen, C 1-3 alkyl, -C 1-3 alkyl-O-C 1-3 alkyl which latter three groups are optionally substituted with one or more fluorine atoms, with the proviso that R 3 and R 4 both are not hydrogen; R 3 and R 4 if both are attached to the same carbon atom, they may together with the carbon atom to which they are attached form a ring selected from the group consisting of cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, piperidinyl, tetrahydrofuranyl, tetrahydropyranyl which latter seven groups are optionally substituted with one or more fluorine atoms; R 5 and R 6 independently represent hydrogen, C 1-5 alkyl, benzyl, -C -C 1-5 alkyl, -C -C 1-5 alkyl, -S 2 -C 1-5 alkyl which latter five groups are optionally substituted with one or more fluorine atoms, R 5 and R 6 together with the nitrogen atom to which they are attached form a 4-6-membered heterocyclyl, piperidinyl, tetrahydrofuranyl or tetrahydropyranyl ring which latter four groups are optionally substituted with one or more fluorine atoms; Q represents CH or N;