Reactant in the synthesis of 2', 5'-Dideoxycytidines and Other Derivatives of 2'-Deoxycytidine. Reactant in the synthesis of Mono- and Diamino Analogues of 2?-Deoxyadenosine, Cordycepin, 9-(3-Deoxy-α-D-Threo-Pentofuranosyl)-Adenine and 9-(2-Deoxy-α-D-Threo-Pentofuranosyl)Adenine.