Patent ID: 7968593

Claim:
A compound of formula II: or a pharmaceutically acceptable salt, an optical isomer or a mixture of optical isomers of the compound, wherein: X is C 1 -C 4 alkylene, C 2 -C 4 alkenylene, C 2 -C 4 alkynylene, C 3 -C 8 cycloalkylene, C 5 -C 7 cycloalkenylene or Ar, wherein the alkylene, alkenylene, alkynylene, cycloalkylene or cycloalkenylene is unsubstituted or substituted with one or more substituents(s); L is a bond, —CR 1 R 2 —, —O—, —S—, —SO 2 — or —NR 1 —; Z is —(CR 5 R 6 ) n —; n is 1, 2, 3 or 4; Ar is a bivalent aryl or heteroaryl radical that is unsubstituted or substituted with one or more substituents(s); and R 1 , R 2 , R 5 and R 6 are independently hydrogen, C 1 -C 4 alkyl or C 2 -C 4 alkenyl, wherein the alkyl or alkenyl is unsubstituted or substituted with one or more substituent(s).