| abstract |
The present invention provides a cationic lipid represented by formula (I) (in the formula, R 1 and R 2 are C8-24 alkyl groups or the like, R 3 is a hydrogen atom, C1-3 alkyl group, formula (A) (in the formula, R 4 and R 5 are hydrogen atoms or the like, n 3 is an integer of 2-6), or formula (B) (in the formula, R 6 and R 7 are hydrogen atoms or the like, n 4 is an integer of 1-6), n 1 is an integer of 0-4, n 2 is an integer of 1-4 (however, cases when n 1 is 0 and n 2 is 1 are excluded)), and compositions and the like containing this cationic lipid and nucleic acid. |