Patent ID: 8309526

Claim:
A compound comprising a lipid having the structure: wherein: R 1 is C 1 -C 24 alkyl, C 1 -C 24 alkenyl, or C 1 -C 24 alkynyl; R 2 , R 3 , R 7 , and R 8 are each, independently, hydrogen, NO 2 , OH, or OOH and at least one of R 2 , R 3 , R 7 , and R 8 is NO 2 ; R 4 is C 1 -C 24 alkyl, C 1 -C 24 alkenyl, or C 1 -C 23 alkenyl and includes a terminal COOR 6 ; R 6 is hydrogen, C 1 -C 24 alkyl, or a pharmaceutically acceptable counterion; R 5 is hydrogen; and n is from 1 to 24; wherein the compound is substantially pure.