[figure: see text] 5'-Deoxy-5'-thioguanosine-5'-monophosphorothioate (GSMP) was synthesized in four steps with 35% overall yield. GSMP serves as a good substrate for in vitro transcription with T7 RNA polymerase to yield 5'-GSMP-RNA, which was converted to 5'-HS-RNA by dephosphorylation with alkaline phosphatase. The thiol-reactive agents can be efficiently introduced into the 5'-terminus of RNA.
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Zhang et al. (2000) studied this question.
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