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盐酸阿糖胞苷
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[5-(4-acetamido-2-oxopyrimidin-1-yl)-3,4-diacetyloxyoxolan-2-yl]methyl acetate
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[3,4-diacetyloxy-5-(4-amino-2-oxopyrimidin-1-yl)oxolan-2-yl]methyl acetate