What is described is a compound of formula I
consisting of a compound in which R
1
is a branched chain alkyl consisting of 10 to 31 carbons; R
2
is a linear alkyl, alkenyl, or alkynyl consisting of 2 to 20 carbons; L
1
and L
2
are the same or different, each a linear alkylene of 1 to 20 carbons or a linear alkenylene of 2 to 20 carbons; X
1
is S or O; R
3
is a linear or branched alkylene consisting of 1 to 6 carbons; and R
4
and R
5
are the same or different, each a hydrogen or a linear or branched alkyl consisting of 1 to 6 carbons; or a pharmaceutically acceptable salt thereof.
描述的是一种化合物,其
化学式为I,包括以下成分:
R1为由10至31个碳组成的支链烷基化合物;
R2为由2至20个碳组成的直链烷基、烯基或炔基;
L1和
L2相同或不同,每个为由1至20个碳组成的直链烷基或由2至20个碳组成的直链烯基;
X1为S或O;
R3为由1至6个碳组成的直链或支链烷基;
R4和R5相同或不同,每个为氢或由1至6个碳组成的直链或支链烷基;或其药用可接受盐。