Patent ID: 7214806

Claim:
A compound of the formula wherein each R 1 , R′ 1 , R 2 , R′ 2 , R 3 , R′ 3 , R 4 or R 5 is independently selected from the group consisting of alkyl, aryl, aralkyl and —CH 2 —CH(OR 6 )—CH 2 N + R 1 R 2 R 3 An − , wherein any R 1 , R 2 or R 3 group may be the same or different than other R 1 , R′ 1 , R 2 , R′ 2 , R 3 or R′ 3 groups, and wherein each R 6 can be independently selected from the group consisting of H, alkyl and aralkyl, a 2,3-epoxypropyl group having the structure: and a 3-chloro-2-hydroxypropyl group having the structure: and wherein An − is an anion, provided that at least one of the R 6 groups is the 2,3-epoxypropyl group or the 3-chloro-2-hydroxypropyl group.