Patent ID: 8772509

Claim:
A compound represented by a formula: wherein each R 1a -R 1d is independently selected from hydrogen, halogen, hydroxyl, thiol, sulfo, nitro, cyano, alkoxyl, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, optionally substituted aryl, and optionally substituted heteroaryl; provided that at least one of R 1a or R 1c is F; wherein n is 0, 1, or 2; wherein R 2 is selected from hydrogen, halogen, hydroxyl, thiol, sulfo, nitro, cyano, alkoxyl, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, optionally substituted aryl, and optionally substituted heteroaryl; wherein R 3 comprises two substituents independently selected from hydrogen, halogen, hydroxyl, thiol, sulfo, nitro, cyano, alkoxyl, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, optionally substituted aryl, and optionally substituted heteroaryl; wherein R 4 is selected from hydrogen, a hydrolysable residue, and optionally substituted alkyl; wherein A 1 is selected from optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, optionally substituted aryl, and optionally substituted heteroaryl; and wherein A 2 is selected from optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, optionally substituted aryl, and optionally substituted heteroaryl.