Fig. 1.
Chemical structure of a Tetra-(N 1,N 1,N 14,N 14-myristeroyloxyethyl)-spermine (spermine-C14), b Tetra-(N 1,N 1,N 14,N 14-palmitoyloxyethyl)-spermine (spermine-C16), and c Tetra-(N 1,N 1,N 14,N 14-steroyloxyethyl)-spermine (spermine-C18)
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