What is described is a compound of formula I
wherein
R
1
consists of a linear or branched alkyl consisting of 1-18 carbons, an alkenyl or alkynyl consisting of 2 to 12 carbons, or a cholesteryl;
R
2
consists of a linear or branched alkyl or an alkenyl consisting of 1 to 18 carbons;
L
1
consists of a linear alkyl consisting of 5 to 9 carbons or, when R
1
consists of a cholesteryl then L
1
consists of a linear alkylene or alkenyl consisting of 3 to 4 carbons;
X
1
consists of —O—(CO)— or —(CO)—O—;
X
2
consists of S or O;
L
2
consists of a bond or a linear alkylene of 1 to 6 carbons;
R
3
consists of a linear or branched alkylene with 1 to 6 carbons; and
R
4
and R
5
are the same or different, each consisting of a linear or branched alkyl of 1 to 6 carbons;
or a pharmaceutically acceptable salt thereof.
描述的是一种I式化合物,其中R1由1-18个碳原子的线性或支链烷基、2-12个碳原子的烯基或炔基,或
胆固醇基组成;R2由1-18个碳原子的线性或支链烷基或烯基组成;L1由5-9个碳原子的线性烷基组成,或者当R1由
胆固醇基组成时,L1由3-4个碳原子的线性烷基或烯基组成;X1由—O—(CO)—或—(CO)—O—组成;X2由S或O组成;
L2由键或1-6个碳原子的线性烷基组成;R3由1-6个碳原子的线性或支链烷基组成;R4和R5相同或不同,均由1-6个碳原子的线性或支链烷基组成;或其药学上可接受的盐。