Figure 2.
Nucleoside analogs with a modified heterocyclic fragment (Het = uracil-1-yl, 5-fluorouracil-1-yl, 5-bromouracil-1-yl, 5-iodouracil-1-yl, thymin-1-yl, cytisin-1-yl, adenin-9-yl, 2,4-dioxo- 3,4-dihydroquinazolin-1(2H)-yl, n = 1, 3, 4).
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