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Methyl 2-[[[(2R,5R)-2-(2-amino-6-oxo-1H-purin-9-yl)-3-methyl-8-oxo-4,7,9-trioxatricyclo[4.3.0.01,3]nonan-5-yl]methoxy-[(1-methoxy-4-methyl-1-oxopentan-2-yl)amino]phosphoryl]amino]-4-methylpentanoate


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