Patent ID: 7326801

Claim:
A compound of formula I wherein m is 1,2 or 3; X is O R 1 is H; C 1-6 alkyl optionally substituted by OH, acyl, halogen, cycloalkyl, phenyl or hydroxy-phenylene; C 2-6 alkenyl; C 2-6 alkynyl; or phenyl optionally substituted by OH; R 2 is wherein R 5 is H or C 1-4 alkyl optionally substituted by 1, 2 or 3 halogen atoms, and R 6 is H or C 1-4 alkyl optionally substituted by halogen; each of R 3 and R 4 , independently, is H, C 1-4 alkyl optionally substituted by halogen, or acyl, and R is a residue of formula (a) wherein R 7 is H, C 1-4 alkyl or C 1-4 alkoxy, and R 8 is (a) C 1-20 alkanoyl, or C 1-14 alkoxy substituted with cycloalkyl or phenyl wherein the cycloalkyl or phenyl ring is optionally substituted by halogen, C 1-4 alkyl and/or C 1-4 alkoxy, (b) phenylC 1-14 alkyl wherein the C 1-14 alkyl is optionally substituted by halogen or OH, (c) cycloalkylC 1-14 alkoxy or phenylC 1-14 alkoxy wherein the cycloalkyl or phenyl ring is optionally substituted by halogen, C 1-4 alkyl and/or C 1-4 alkoxy, or (d) phenylC 1-4 alkoxyC 1-4 alkyl, phenoxyC 1-14 alkoxy or phenoxyC 1-4 alkyl, in free form or in salt form.