Compound Or Salt Thereof, Lipid Composition, Pharmaceutical Composition, And Delivery Carrier

Abstract: The present invention addresses the problem of providing: a compound, or a salt thereof, which constitutes a lipid composition that can realize a high nucleic acid encapsulation rate and excellent nucleic acid delivery when mRNA is used; and a lipid composition, a pharmaceutical composition, and a delivery carrier that can realize a high nucleic acid encapsulation rate and excellent nucleic acid delivery when mRNA is used. The present invention provides a compound represented by formula (1), or a salt thereof. In the formula, R1 represents a hydrocarbon group having 1-24 carbon atoms; R2 represents a hydrocarbon group having 1-6 carbon atoms, R3 represents a hydrocarbon group having 6-24 carbon atoms and having a branched chain; R4 and R5 each represents a hydrocarbon group having 1-6 carbon atoms which are optionally substituted; R6 represents a hydrogen atom or a hydrocarbon group having 1-18 carbon atoms; L represents *-O-C(O)- or *-C(O)O -; a represents an integer of 1-12; and b, c, and d each represents an integer of 1-4.

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