(S)-2-Amino-4-((((2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl)(3-(dimethylamino)propyl)amino)butanoic acid 2,2,2-trifluoroacetic acid salt, 97%, 1mg