Patent ID: 7265244

Claim:
A compound of formula I wherein X is methylene, oxygen, sulphur or a NR 7 group; R 1 is a straight or branched C 1 -C 8 alkyl or C 3 -C 8 alkenylene or C 3 -C 8 alkynylene chain, optionally substituted with CF 3 , phenyl, phenoxy or naphthyl, the aromatic rings optionally substituted by one or more C 1 -C 4 alkyl, halogens, trifluoromethyl, hydroxy or C 1 -C 4 alkoxy groups; R 2 , R 3 are independently hydrogen, a C 1 -C 3 alkyl chain, halogen, trifluoromethyl, hydroxy or C 1 -C 4 alkoxy groups; R 4 , R 5 , R 6 , R 7 are independently hydrogen or C 1 -C 6 alkyl; and the pharmaceutically acceptable salts thereof.