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Propan-2-yl (2S)-2-[[[(3aR,4R,6aR)-4-(2,4-dioxopyrimidin-1-yl)-3a-ethynyl-2-oxo-6,6a-dihydro-4H-furo[3,4-d][1,3]dioxol-6-yl]methoxy-phenoxyphosphoryl]amino]propanoate


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