Patent ID: 8247571

Claim:
A compound comprising the following structure: or a solvate thereof, wherein NR 1 R 2 and NR 3 R 4 are in the ortho, meta or para positions; X − is an anionic salt; R 1 , R 2 , R 3 , or R 4 are the same or different and independently selected from the group consisting of C 1-10 alkyl (linear or branched) and alkenes (linear or branched), or wherein R 1 and R 2 or R 3 and R 4 taken together with the nitrogen atom to which they are attached form pyrrolidino or piperidino rings; and R 5 is a polyalkylene glycol moiety comprising a C 1-5 alkyl (linear or branched) substituted polyethylene glycol, a C 2-5 alkene (linear or branched) substituted polyethylene glycol or a C 2-5 alkyne substituted polyethylene glycol.