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2-O-tert-butyldimethylsilyl-n2-isobutyrylguanosine

2-O-tert-butyldimethylsilyluridine

2-(Butylthio)pyrimidine-5-carbaldehyde

2-(Sec-butylthio)pyrimidine-5-carbaldehyde

5-Carbamoylmethyl-2-o-methyluridine

5-Carbamoylmethyluridine

5-Carboxyhydroxymethyluridine

5-(Carboxyhydroxymethyl)uridine methyl ester

5-Carboxymethyl-2-thiouridine

5-Carboxymethylaminomethyluridine