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Ethyl 2-[[[(3aR,4R,6R,6aR)-4-[4-(butan-2-ylamino)-2-oxopyrimidin-1-yl]-3a-methyl-2-oxo-6,6a-dihydro-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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