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The protected hydrazide‐linked uracil‐ and adenine‐derived tetranucleoside analogues 17, 19, and 21 were synthesized in solution by coupling the dimeric hydrazines 6 and 10 with the carboxylic acids 7, 11, and 16. These hydrazines and acids were obtained by partially deprotecting the hydrazines 5, 9, and 15, and these were prepared by coupling the hydrazines 3 and 14 with the carboxylic acids 4 and...
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