Patent ID: 8188082

Claim:
A compound of formula (II): wherein X represents CH 2 or O; R 1 represents a phenyl group, which group is independently mono-, di-, or tri-substituted wherein the substituents are independently selected from the group consisting of (C 1-4 )alkyl, (C 1-4 )alkoxy, halogen, cyano, trifluoromethoxy and trifluoromethyl; R 2 represents (C 1-4 )alkyl, (C 1-4 )alkoxy, (C 2-4 )alkenyl, halogen, cyano, hydroxymethyl, trifluoromethyl, C(O)NR 5 R 6 or cyclopropyl; R 3 represents (C 1-4 )alkyl, (C 1-4 )alkoxy-methyl or halogen; R 4 represents (C 1-4 )alkyl; R 5 represents hydrogen or (C 1-4 )alkyl; and R 6 represents hydrogen or (C 1-4 )alkyl; wherein, when X represents CH 2 , the absolute configuration is [(R)-2′; (S)-8]; or, when X represents O, the absolute configuration is [(R)-2′; (R)-8]; or a pharmaceutical acceptable salt thereof.