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Ethyl 2-[[[(4R)-4-(2-amino-6-methoxypurin-9-yl)-3a-methyl-2-oxo-4H-furo[3,4-d][1,3]dioxol-6-yl]methoxy-[(1-ethoxy-4-methyl-1-oxopentan-2-yl)amino]phosphoryl]amino]-4-methylpentanoate


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