The present invention relates to novel compounds of formula (I), or a pharmaceutically acceptable salt or solvate thereof, wherein R is an aryl or heteroaryl; which may be substituted by one or more: halogen, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 haloalkyl, C1-C4 haloalkoxy, cyano; Z1 is H, C1-C4 alkyl or F; Z is CH2, CH(C1-C4 alkyl), C(C1-C4 alkyl)2 or a bond; A is a 5 membered heteroaryl, which may be substituted by one or more: halogen, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 haloalkyl, Cl C4 haloalkoxy, cyano; B is hydrogen or is a 5-6 membered heteroaryl, or phenyl, which may be substituted by one or more: halogen, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 haloalkyl, C1-C4 haloalkoxy, cyano; being A and B linked via any atom; processes for their preparation, intermediates used in these processes, pharmaceutical compositions containing them and their use in therapy, as NPY Y5 receptor antagonists and as agents for the treatment and/or prophylaxis of eating disorders such as a binge eating disorder.