9h-purin-6-amine, 9-[5-o-[hydroxy[[hydroxy[3-hydroxy-2,2-dimethyl-4-[[3-[[2-[(2-methyl-1,3-dioxobutyl)thio]ethyl]amino]-3-oxopropyl]amino]-4-oxobutoxy]phosphinyl]oxy]phosphinyl]-3-o-phosphonopentofuranosyl]-

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