Patent ID: 7968592

Claim:
A compound of general formula I wherein m is an integer from 1 to 3 X is methylene, oxygen, sulphur or a NR 6 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 or phenyl, 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 are independently hydrogen or C 1 -C 6 alkyl; and the pharmaceutically acceptable salts thereof; provided that: when R 1 is phenyl, benzyl, 2-phenethyl or 3-phenpropyl optionally and independently substituted on the phenyl ring by one or two C 1 -C 6 alkyl, halogen, hydroxy, C 1 -C 4 alkoxy or trifluoromethyl and X is oxygen, sulphur, methylene or —NH—, at least one of R 2 or R 3 is other than hydrogen; if m is 3, R 1 —X 4-benzyloxy, R 2 , R 4 and R 5 hydrogen, then R 3 is other than 3-methoxy; and if m is 3, R 1 —X 3-benzyloxy, R 2 , R 4 and R 5 hydrogen, then R 3 is other than 4-methoxy.