Compounds having activity at the m1 receptor and their uses in medicine.

A compound of formula (I) or a salt or solvate thereof: ** ** Formula wherein: R 4 is fluoro; R 5 R 6 R 4 R 5 is selected from hydrogen, halogen, cyano, C1-6 alkyl, C1-6 alkyl substituted with one or more fluorine atoms, C1-6 alkoxy and C1-6 alkoxy substituted with one or more atoms fluorine; R 6 is selected from halogen, cyano, C1-6 alkyl, C1-6 alkyl substituted with one or more fluorine atoms, C3-6cycloalkyl, C3-6cycloalkyl substituted with one or more fluorine atoms, C1-6alkoxy and C1-6 alkoxy substituted by one or more fluorine atoms, and Q is hydrogen or C1-6 alkyl.