Abstract: A compound of formula (I) or a pharmaceutically acceptable salt, solvate, or hydrolysable ester thereof, Wherein: R1 and R2 are independently hydrogen or C1-3 alkyl; X represents a bond, CH2 or O; R3 and R4 are independently hydrogen, C1-6 alkyl, OCH3, CF3, allyl or halogen; X1 is CH2, SO2, or CO; R5 is —C1-6 alkyl (optionally substituted by C1-6alkoxy or C1-6alkylthio), —C2-6 alkenyl, —C0-6 alkyl phenyl (wherein the phenyl is optionally substituted by one or more CF3, halogen, C1-3 alkyl, C1-3 alkoxy), —COC1-6 alkyl, SO2C1-6 alkyl; R6 is phenyl or a 6 membered heteroaryl group containing 1, 2 or 3 N atoms wherein the phenyl or heteroaryl group is optionally substituted with 1, 2 or 3 moieties selected from the group consisting of C1-6 alkyl, halogen, —OC1-6 alkyl, —SO2C1-3 alkyl, phenyl (optionally substituted by one or more groups selected from halogen, CF3, C1-3 alkyl, OC1-3 alkyl, acetyl, CN).

Abstract: A compound of formula (I) or a pharmaceutically acceptable salt, solvate, or hydrolysable ester thereof, Wherein: R1 and R2 are independently hydrogen or C1-3 alkyl; X represents a bond, CH2 or O; R3 and R4 are independently hydrogen, C1-6 alkyl, OCH3, CF3, allyl or halogen; X1 is CH2, SO2, or CO; R5 is —C1-6 alkyl (optionally substituted by C1-6alkoxy or C1-6alkylthio), —C2-6 alkenyl, —C0-6 alkyl phenyl (wherein the phenyl is optionally substituted by one or more CF3, halogen, C1-3 alkyl, C1-3 alkoxy), —COC1-6 alkyl, SO2C1-6 alkyl; R6 is phenyl or a 6 membered heteroaryl group containing 1, 2 or 3 N atoms wherein the phenyl or heteroaryl group is optionally substituted with 1, 2 or 3 moieties selected from the group consisting of C1-6 alkyl, halogen, —OC1-6 alkyl, —SO2C1-3 alkyl, phenyl (optionally substituted by one or more groups selected from halogen, CF3, C1-3 alkyl, OC1-3 alkyl, acetyl, CN).