Patent ID: 8399481

Claim:
A compound of formula (I): or a pharmaceutically acceptable salt thereof, wherein: A is a chemical moiety having formula (II): X is selected from the group consisting of CH 2 , C(═O), CH(R 5 ), C(R 5 )(R 6 ), and C(R 5 )(R 6 )CH 2 ; R 1 is selected from the group consisting of optionally substituted arylalkyl and optionally substituted heteroarylalkyl; R 2 is selected from the group consisting of optionally substituted aryl, optionally substituted heteroaryl, and NR 7 R 8 ; R 3 is selected from the group consisting of hydrogen, halogen, hydroxyl, alkoxy, aryloxy, optionally substituted alkyl, optionally substituted amino, optionally substituted amino sulfonyl and nitrile; R 4 is selected from the group consisting of hydrogen, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, optionally substituted acyl, optionally substituted sulfonyl, optionally substituted sulfamoyl, optionally substituted aryl, optionally substituted arylalkyl, and optionally substituted heteroaryl; R 5 and R 6 for each occurrence is optionally substituted alkyl; R 7 and R 8 are the same or different and each represents hydrogen, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted arylalkyl, optionally substituted aryl or optionally substituted heteroaryl; and n=1 or 2.