Patent ID: 8278482

Claim:
A compound of Formula I or a salt thereof, wherein: n is an integer from 0 to 12; m is an integer from 1 to 12; Z 1 is Cl or Br; Z 2 is H, Cl or Br; Y is a single bond, or is selected from the group consisting of —CF 2 —, —CHF—, —C(CF 3 )H—, and —C(═O)—, X is N, P or S; A 1 and A 2 are each independently selected from the group consisting of alkyl, aryl, cycloalkyl, heteroalkyl, heteroaryl, and heterocycloalkyl, each of which may be optionally substituted; or A 1 and A 2 together with the carbon atom to which they are attached form a cycloalkyl or heterocycloalkyl group, each of which may be optionally substituted; R 1 and R 2 are each independently selected from the group consisting of alkyl, aryl, cycloalkyl, heteroalkyl, heteroaryl, and heterocycloalkyl, each of which may be optionally substituted; or R 1 and R 2 together with the X atom to which they are attached form an optionally substituted heterocycloalkyl group; R 3 is alkyl, aryl, cycloalkyl, heteroalkyl, heteroaryl or heterocycloalkyl, each of which may be optionally substituted, and may further be O when X is N; R a , R b , R c and R d are each independently selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, heteroalkyl, heteroaryl and heterocycloalkyl, each of which may be optionally substituted; and Q is a counter ion or absent; with the proviso that R 3 is absent when X is S.