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Chou T S;Health P C;Patterson L E Stereospecific synthesis of 2-deoxy-2,2-difluororibonolactone and its use in the preparation of 2¡ä-deoxy-2¡ä,2-difluoro-¦Â-D-ribofuranosyl pyrimidine nucleosides:the key role of selective crystallization[ÍâÎÄÆÚ¿¯] 1992
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