| abstract |
The present invention provides a cationic lipid represented by the formula (I), a composition containing the cationic lipid and a nucleic acid, and a nucleic acid introduced into the cell using the composition containing the cationic lipid and the nucleic acid. The method to the inside of the cell. □ (wherein R1 and R2 are the same or different and are alkenyl groups, etc., X1 and X2 are a hydrogen atom, or a single bond or an alkyl group is formed together, X3 is absent, or an alkyl group, etc., Y does not exist, or As an anion, a and b are the same or different, 0 to 3, L3 is a single bond, etc., R3 is an alkyl group, and L1 and L2 are -O-, -CO-O- or -O-CO-). |