What is described is a compound of formula (I), wherein R1 and R2 are the same or different, each a linear or branched alkyl with 1-9 carbons, or an alkenyl or alkynyl with 2 to 11 carbon atoms; L1 and L2 are the same or different, each a linear alkyl having 5 to 18 carbon atoms, or form a heterocycle with N; X1 is a bond, or is -CO-O- whereby L2-CO-O-R2 is formed; X2 is S or O; L3 is a bond or a lower alkyl, or form a heterocycle with N; R3 is a lower alkyl; and R4 and R5 are the same or different, each a lower alkyl; or a pharmaceutically acceptable salt thereof.
所描述的是一种具有
化学式(I)的化合物,其中R1和R2相同或不同,各自是具有1-9个碳原子的直链或支链烷基,或具有2-11个碳原子的烯烃或
炔烃;L1和
L2相同或不同,各自是具有5-18个碳原子的直链烷基,或与N形成杂环;X1是键,或是-CO-O-,从而形成
L2-CO-O-R2;X2是S或O;L3是键或低烷基,或与N形成杂环;R3是低烷基;R4和R5相同或不同,各自是低烷基;或其药用可接受的盐。