Patent ID: 8288545

Claim:
A compound of formula Ia or Ib: wherein represents a heterocyclic, nitrogen containing group, and wherein represents a heterocyclic, nitrogen containing group bearing a permanent positive charge; wherein X is CH 2 , CHY, CY 2 , Câ•O, or CYZ, where Y and Z are, independently, H; F; Cl; Br; alkyl (C 1-6 ); substituted alkyl (C 1-6 ), where the substituent is connected via O, N or S; OR 1 ; or NR 1 R 2 , where R 1 and R 2 are, independently, H, alkyl (C 1-10 ) optionally substituted; or where Y and Z are connected in the form of a carbocycle (C 3-7 ); and wherein 2A + is one or more counterions.