Patent ID: 7410958

Claim:
A compound of formula (II): wherein R 1 , R 4 , and R 7 are each independently absent or (C 1 -C 5 )alkylenecarbonyl; R 3 and R 6 are each independently absent or oxy; R 2 , R 5 , and R 8 are each independently hydrogen, hydroxyl, N + -containing heteroaryl, N + -containing heterocyclyl, or —N + R a R b R c ; provided at least one of R 2 , R 5 , and R 8 is N + -containing heteroaryl, N + -containing heterocyclyl, or N + R a R b R c ; R a , R b , and R c are each independently (C 1 -C 24 )alkyl; any N + -containing heteroaryl, N + -containing heterocyclyl, R a , R b , or R c of R 2 , R 5 , and R 8 can optionally be substituted on carbon with one or more —NR d R e ; R d and R e are each independently hydrogen or alkyl; any alkyl or alkylene of R 1 , R 2 , R 4 , R 5 , R 7 , or R 8 can be optionally substituted on carbon with one or more —NR d R e ; or a salt thereof.