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5-Methyl-2-thiouridine

5-Methoxy-2-thiouridine

5-(N-Methyl-N-trifluoroacetyl-aminomethyl)-2-thiouridine

5-(N-t-Butyloxycarbonylmethyl)-N-(trifluoroacetyl) aminomethyl)-2-thiouridine

5-Methyl-4-thiouridine

5-Ethyl-4-thiouridine

5-Methoxy-4-thiouridine

8-Allylthioadenosine

8-Allylthioguanosine

6-Amino-3-iodo-4-methoxy-1-(b-D-ribofuranosyl)-1H-pyrazolo[3,4-d]pyrimidine