Intracellular delivery vehicle

A compound having a chemical structure represented by general formula (I):

• wherein
• Y represents a single bond or CHR85,
• Z represents a single bond or CHR86,
• R72 and R73 are each independently selected from C1-6 alky group,
• R75, R76, R77, R78, R85 and R86 are each independently selected from the group consisting of a hydrogen atom, C1-6 alkyl group, C1-6 alkoxy group, C1-6 alkylcarbonyl group, phenyl group and hydroxyl group, wherein said C1-6 alkyl group, C1-6 alkoxy group, C1-6 alkylcarbonyl group and phenyl group are optionally substituted with 1 or 2 substituents selected from the group consisting of C1-6 alkyl group, C1-6 alkoxy group, C1-6 alkylcarbonyl group, phenyl group and hydroxyl group,
• or
• R75 and R76 or R77 and R78 together optionally form —(CH2)3-5—,
• R81, R82, R83 and R84 are a substituent selected from the group consisting of C1-4 alkyl group, C1-4 alkylcarbonyl group and C1-3 alkoxy group, wherein the C1-4 alkyl is optionally substituted with one C1-3 alkoxy group;
• and
• R71 and R74 each independently are C1-3 alkyl group, and
• Xf− is counter anion.