Patent ID: 8415486

Claim:
A compound of Formula (I): or a pharmaceutically acceptable salt thereof, wherein: X1 and X2 are each independently O, or S: n is 0 or 1; R is selected from H; alkyl; substituted alkyl; alkenyl; substituted alkenyl; cycloalkyl; substituted cycloalkyl; aryl; substituted aryl; heteroaryl; or substituted heteroaryl; R1a and R1b are each independently selected from H; alkyl; or substituted alkyl; R2 is selected from H; alkyl; substituted alkyl; cycloalkyl; substituted cycloalkyl; heterocycloalkyl; substituted heterocycloalkyl; aryl; substituted aryl; heteroaryl; or substituted heteroaryl; R5 is selected from H; alkyl; substituted alkyl; cycloalkyl; substituted cycloalkyl; aryl; substituted aryl; heterocycloalkyl; substituted heterocycloalkyl; heteroaryl; or substituted heteroaryl; R6 is selected from H; alkyl; substituted alkyl; alkoxy; substituted alkoxy; alkylsulfonyl; arylsulfonyl; cycloalkyl; substituted cycloalkyl; heterocycloalkyl; substituted heterocycloalkyl; aryl; substituted aryl; heteroaryl; or substituted heteroaryl; and R12 is selected from H; or hydroxy.