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(3Ar,4R,6R,6aR)-4-(2-amino-6-ethoxypurin-7-yl)-3a-methyl-6-[[(2R,4S)-2-oxo-4-phenyl-1,3,2lambda5-dioxaphosphinan-2-yl]oxymethyl]-6,6a-dihydro-4H-furo[3,4-d][1,3]dioxol-2-one


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