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(2013)N-3-tert-butoxycarbonyl-1-(6-deoxy-6-di(S-benzoylthio)ethylphosphono-2,3-O-isopropylidene-β-D-ribo-(5S)-hexofuranosyl)uracil
1-(6-deoxy-6-di(S-benzoylthio)ethylphosphono-β-D-ribo-(5S)-hexofuranosyl)uracil
N-4-di(tert-butoxycarbonyl)-1-(6-deoxy-6-di(S-benzoylthio)ethylphosphono-2,3-O-isopropylid-ene-β-D-ribo-(5S)-hexofuranosyl)cytosine
1-(6-deoxy-6-di(S-benzoylthio)ethylphosphono-β-D-ribo-(5S)-hexofuranosyl)cytosine