Patent ID: 8399436

Claim:
A compound of formula (I) or a prodrug thereof in which R a is a group of formula (a1) in which R 1a is C 1-6 alkyl, CF 3 , OCF 3 , C 1-6 alkoxy or R 1a is a group L 1 -Z 1 in which L 1 is O, CH 2 , OCH 2 or CH 2 O and Z 1 is C 3-7 cycloalkyl or aryl; or R a is a group of formula (a2) in which R 2a is halogen, C 1-6 alkyl, CF 3 or OCH 2 Ph; and R 3a is halogen, C 1-6 alkyl, C 1-6 alkoxy, hydroxy, C 3-7 cycloalkyl, CO 2 C 1-4 alkyl or R 3a is a group L 2 -Z 2 in which L 2 is O, CH 2 or O(CH 2 ) n wherein n is an integer from 1-7; and Z 2 is hydroxy, methoxy, CO 2 C 1-4 alkyl, C 3-7 cycloalkyl, aryl or heteroaryl; or R a is a group of formula (a3) in which R 4a is halogen, C 1-6 alkyl, C 1-6 alkoxy, CF 3 or OCH 2 Ph; and R 5a is halogen, C 1-6 alkyl, hydroxy, C 1-6 alkoxy optionally substituted by methoxy, or R 5a is a group L 3 -Z 3 in which L 3 is a single bond, O, CH 2 , OCH 2 or CH 2 O and Z 3 is C 3-7 cycloalkyl, aryl or heteroaryl; or R a is a group of formula (a4) in which R 6a is Cl, Br, C 1-6 alkyl or CF 3 ; and R 7a halogen, C 1-6 alkyl, CF 3 , OCF 3 , OCHF 2 , C 1-6 alkoxy or R 7a is group L 4 -Z 4 in which L 4 is OCH 2 and Z 4 is C 3-7 cycloalkyl R b is a group of formula (b) wherein Y is CH or N, R 1b is halogen, C 1-6 alkyl or CF 3 ; R 2b is H, halogen, C 1-6 alkyl or C 1-6 alkoxy or a salt thereof subject to the proviso that it is not a compound selected from 2,6-Difluoro-N-{1-[(2-methylphenyl)methyl]-1H-pyrazol-3-yl}benzamide; 2-Fluoro-N-{1-[(2-methylphenyl)methyl]-1H-pyrazol-3-yl}benzamide; 2,6-Dichloro-N-{1-[(2-methylphenyl)methyl]-1H-pyrazol-3-yl}benzamide; 2-Methyl-N-{1-[(2-methylphenyl]-1H-pyrazol-3-yl}benzamide; and 2-Bromo-N-[1-{(2,5-dichlorophenyl)methyl]-1H-pyrazol-3-yl}benzamide.