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Chemical structure of the cationic lipids: a N 1,N 1-dimyristeroyloxyethyl-1,2-diaminoethane; b N 1,N 1-dimyristeroyloxyethyl-1,3-diaminopropane; c N 1,N 1-dimyristeroyloxyethyl-3-monoazapentane-1,5-diamine; d N 1,N 1-dimyristeroyloxyethyl-spermine; e N 1,N 1-palmitoyloxyethyl-spermine; and f N 1,N 1-steroyloxyethyl-spermine
