Patent ID: 8143252

Claim:
A compound, or a pharmaceutically acceptable salt thereof, having the following structure: wherein (i) R 5 and R 6 are each independently H, alkyl, cycloalkyl, aryl, hydroxyl or alkenyl; R 7 -R 11 are each F or Cl; and R 12 is H or alkyl; or (ii) R 5 and R 6 are each independently H, alkyl, cycloalkyl, aryl, hydroxyl or alkenyl; R 7 -R 10 are each F or Cl; R 11 is H; and R 12 is H or alkyl; or (iii) R 5 and R 6 are each independently alkyl or cycloalkyl; R 7 -R 10 are each F or Cl; and R 11 and R 12 together form a 5-member or 6-member ring structure.